This test used to take more than 10min because an instance of valgrind
was launched for each separate equivalence check.  The list of
equivalences to checks are not given in a file, and only two valgrind
instances are run.  The test takes less than 15sec.

* src/ltltest/equalsf.cc: New file.
* src/ltltest/Makefile.am (reduccmp, reductaustr): Build using
equalsf.cc.
* src/ltltest/reduccmp.test: Rewrite.
* src/ltltest/uwrm.test: Also rewrite, and use valgrind.

star_normal_form() used to be called under bounded
repetitions like [*0..4], but some of these rewritings
are only correct for [*0..].  For instance
     (a*|1)[*]      can be rewritten to    1[*]
but  (a*|1)[*0..1]  cannot be rewritten to 1[*0..1]
it would be correct to rewrite the latter as (a[+]|1)[*0..1],
canceling the empty word in a*.

Also (a*;b*)[*]     can be rewritten to    (a|b)[*]
but  (a*;b*)[*0..1]  cannot be rewritten to (a|b)[*0..1]
and it cannot either be rewritten to (a[+]|b[+])[*0..1].

This patch introduces a new function to implement
rewritings under bounded repetition.

* src/ltlvisit/snf.hh, src/ltlvisit/snf.cc (star_normal_form_unbounded):
New function.
* src/ltlvisit/simplify.cc: Use it.
* src/ltltest/reduccmp.test: Add tests.
* doc/tl/tl.tex: Document the rewritings implemented.

* src/tgbaalgos/ltl2tgba_fm.cc: Here.
* src/ltltest/reduccmp.test: Add a test case.
* NEWS: Mention it.

* src/ltlvisit/simplify.cc: Remove two incorrect rules, and
partially disable another one.
* doc/tl/tl.tex: Reflect the change.
* src/ltltest/reduccmp.test: Likewise.
* src/ltltest/equals.cc: Add safety checks to catch such errors in the
future.
* NEWS: Mention the bug.

And also speedup implication checks for Boolean expressions.

* src/ltlvisit/simplify.cc: Improve implication-based rules
rules for multops by checking one operand against all the
other at once (instead of one by one).  Do not break
Boolean expressions while performing implication checks.
* src/ltlvisit/simplify.hh: Typo.
* src/ltltest/reduccmp.test: More tests.

When something like XFa & FXa is reduced, the subformulae XFa and FXa
are both rewritten separately to XFa, and then the vector of arguments
of the And operators, [XFa,XFa], is passed through a specialized loop
that searches of the form X(...) that can potentially be simplified with
some other terms.  This loop converts the vector [XFa,XFa] into the set
{XFa,XFa}={XFa} and forgot to deal with the case where the insertion
would actually not add an existing subformula.

* src/ltlvisit/simplify.cc: Fix the code for Or, and And.
* src/ltltest/reduc0.test: New file, to test it.
* src/ltltest/Makefile.am (TESTS): Add it.
* src/ltltest/reduccmp.test: Add an extra test that does not
trigger the bug (because reduccmp.test uses more than basic
optimizations, and the implication-based simplifications are
already able to detect that XFa and FXa are equivalent).

GF(a|Xb) = GF(a|b)      GF(a|Fb) = GF(a|b)
FG(a&Xb) = FG(a&b)      FG(a&Gb) = FG(a&b)

* src/ltlvisit/simplify.cc: Implement them.
* NEWS, doc/tl/tl.tex: Document them.
* src/ltltest/reduccmp.test: Test then.

* NEWS: Mention this.
* COPYING: Replace by GPL v3.
* src/sanity/style.test: Check files with the wrong license,
in case we forgot to update it during a merge.
* Makefile.am, bench/Makefile.am, bench/emptchk/Makefile.am,
bench/emptchk/defs.in, bench/emptchk/ltl-human.sh,
bench/emptchk/ltl-random.sh, bench/emptchk/pml-clserv.sh,
bench/emptchk/pml-eeaean.sh, bench/emptchk/pml2tgba.pl,
bench/ltl2tgba/big, bench/ltl2tgba/defs.in, bench/ltl2tgba/known,
bench/ltl2tgba/lbtt2csv.pl, bench/ltl2tgba/ltl2baw.in,
bench/ltl2tgba/parseout.pl, bench/ltl2tgba/small,
bench/ltlclasses/Makefile.am, bench/ltlclasses/defs.in,
bench/ltlclasses/run, bench/ltlcounter/Makefile.am,
bench/ltlcounter/defs.in, bench/ltlcounter/run,
bench/scc-stats/Makefile.am, bench/scc-stats/stats.cc,
bench/split-product/Makefile.am, bench/split-product/cutscc.cc,
bench/split-product/pml2tgba.pl, bench/wdba/Makefile.am,
bench/wdba/defs.in, bench/wdba/run, configure.ac, doc/Makefile.am,
doc/dot.in, doc/tl/Makefile.am, iface/Makefile.am,
iface/dve2/Makefile.am, iface/dve2/defs.in, iface/dve2/dve2.cc,
iface/dve2/dve2.hh, iface/dve2/dve2check.cc,
iface/dve2/dve2check.test, iface/dve2/finite.test,
iface/dve2/kripke.test, iface/gspn/Makefile.am, iface/gspn/common.cc,
iface/gspn/common.hh, iface/gspn/dcswave.test,
iface/gspn/dcswaveeltl.test, iface/gspn/dcswavefm.test,
iface/gspn/dcswaveltl.test, iface/gspn/dottygspn.cc,
iface/gspn/dottyssp.cc, iface/gspn/gspn.cc, iface/gspn/gspn.hh,
iface/gspn/ltlgspn.cc, iface/gspn/simple.test, iface/gspn/ssp.cc,
iface/gspn/ssp.hh, iface/gspn/udcsefm.test, iface/gspn/udcseltl.test,
iface/gspn/udcsfm.test, iface/gspn/udcsltl.test, src/Makefile.am,
src/bin/Makefile.am, src/bin/common_cout.cc, src/bin/common_cout.hh,
src/bin/common_finput.cc, src/bin/common_finput.hh,
src/bin/common_output.cc, src/bin/common_output.hh,
src/bin/common_post.cc, src/bin/common_post.hh, src/bin/common_r.cc,
src/bin/common_r.hh, src/bin/common_range.cc, src/bin/common_range.hh,
src/bin/common_setup.cc, src/bin/common_setup.hh,
src/bin/common_sys.hh, src/bin/genltl.cc, src/bin/ltl2tgba.cc,
src/bin/ltl2tgta.cc, src/bin/ltlfilt.cc, src/bin/man/Makefile.am,
src/bin/randltl.cc, src/eltlparse/Makefile.am,
src/eltlparse/eltlparse.yy, src/eltlparse/eltlscan.ll,
src/eltlparse/fmterror.cc, src/eltlparse/parsedecl.hh,
src/eltlparse/public.hh, src/eltltest/Makefile.am,
src/eltltest/acc.cc, src/eltltest/acc.test, src/eltltest/defs.in,
src/eltltest/nfa.cc, src/eltltest/nfa.test, src/evtgba/Makefile.am,
src/evtgba/evtgba.cc, src/evtgba/evtgba.hh, src/evtgba/evtgbaiter.hh,
src/evtgba/explicit.cc, src/evtgba/explicit.hh, src/evtgba/product.cc,
src/evtgba/product.hh, src/evtgba/symbol.cc, src/evtgba/symbol.hh,
src/evtgbaalgos/Makefile.am, src/evtgbaalgos/dotty.cc,
src/evtgbaalgos/dotty.hh, src/evtgbaalgos/reachiter.cc,
src/evtgbaalgos/reachiter.hh, src/evtgbaalgos/save.cc,
src/evtgbaalgos/save.hh, src/evtgbaalgos/tgba2evtgba.cc,
src/evtgbaalgos/tgba2evtgba.hh, src/evtgbaparse/Makefile.am,
src/evtgbaparse/evtgbaparse.yy, src/evtgbaparse/evtgbascan.ll,
src/evtgbaparse/fmterror.cc, src/evtgbaparse/parsedecl.hh,
src/evtgbaparse/public.hh, src/evtgbatest/Makefile.am,
src/evtgbatest/defs.in, src/evtgbatest/explicit.cc,
src/evtgbatest/explicit.test, src/evtgbatest/ltl2evtgba.cc,
src/evtgbatest/ltl2evtgba.test, src/evtgbatest/product.cc,
src/evtgbatest/product.test, src/evtgbatest/readsave.cc,
src/evtgbatest/readsave.test, src/kripke/Makefile.am,
src/kripke/fairkripke.cc, src/kripke/fairkripke.hh,
src/kripke/kripke.cc, src/kripke/kripke.hh,
src/kripke/kripkeexplicit.cc, src/kripke/kripkeexplicit.hh,
src/kripke/kripkeprint.cc, src/kripke/kripkeprint.hh,
src/kripkeparse/Makefile.am, src/kripkeparse/fmterror.cc,
src/kripkeparse/kripkeparse.yy, src/kripkeparse/kripkescan.ll,
src/kripkeparse/parsedecl.hh, src/kripkeparse/public.hh,
src/kripkeparse/scankripke.ll, src/kripketest/Makefile.am,
src/kripketest/bad_parsing.test, src/kripketest/defs.in,
src/kripketest/kripke.test, src/kripketest/parse_print_test.cc,
src/ltlast/Makefile.am, src/ltlast/allnodes.hh,
src/ltlast/atomic_prop.cc, src/ltlast/atomic_prop.hh,
src/ltlast/automatop.cc, src/ltlast/automatop.hh, src/ltlast/binop.cc,
src/ltlast/binop.hh, src/ltlast/bunop.cc, src/ltlast/bunop.hh,
src/ltlast/constant.cc, src/ltlast/constant.hh, src/ltlast/formula.cc,
src/ltlast/formula.hh, src/ltlast/formula_tree.cc,
src/ltlast/formula_tree.hh, src/ltlast/multop.cc,
src/ltlast/multop.hh, src/ltlast/nfa.cc, src/ltlast/nfa.hh,
src/ltlast/predecl.hh, src/ltlast/refformula.cc,
src/ltlast/refformula.hh, src/ltlast/unop.cc, src/ltlast/unop.hh,
src/ltlast/visitor.hh, src/ltlenv/Makefile.am, src/ltlenv/declenv.cc,
src/ltlenv/declenv.hh, src/ltlenv/defaultenv.cc,
src/ltlenv/defaultenv.hh, src/ltlenv/environment.hh,
src/ltlparse/Makefile.am, src/ltlparse/fmterror.cc,
src/ltlparse/ltlfile.cc, src/ltlparse/ltlfile.hh,
src/ltlparse/ltlparse.yy, src/ltlparse/ltlscan.ll,
src/ltlparse/parsedecl.hh, src/ltlparse/public.hh,
src/ltltest/Makefile.am, src/ltltest/consterm.cc,
src/ltltest/consterm.test, src/ltltest/defs.in, src/ltltest/equals.cc,
src/ltltest/equals.test, src/ltltest/kind.cc, src/ltltest/kind.test,
src/ltltest/length.cc, src/ltltest/length.test,
src/ltltest/lunabbrev.test, src/ltltest/nenoform.test,
src/ltltest/parse.test, src/ltltest/parseerr.test,
src/ltltest/readltl.cc, src/ltltest/reduc.cc, src/ltltest/reduc.test,
src/ltltest/reduccmp.test, src/ltltest/reducpsl.test,
src/ltltest/syntimpl.cc, src/ltltest/syntimpl.test,
src/ltltest/tostring.cc, src/ltltest/tostring.test,
src/ltltest/tunabbrev.test, src/ltltest/tunenoform.test,
src/ltltest/utf8.test, src/ltltest/uwrm.test,
src/ltlvisit/Makefile.am, src/ltlvisit/apcollect.cc,
src/ltlvisit/apcollect.hh, src/ltlvisit/clone.cc,
src/ltlvisit/clone.hh, src/ltlvisit/contain.cc,
src/ltlvisit/contain.hh, src/ltlvisit/destroy.cc,
src/ltlvisit/destroy.hh, src/ltlvisit/dotty.cc, src/ltlvisit/dotty.hh,
src/ltlvisit/dump.cc, src/ltlvisit/dump.hh, src/ltlvisit/lbt.cc,
src/ltlvisit/lbt.hh, src/ltlvisit/length.cc, src/ltlvisit/length.hh,
src/ltlvisit/lunabbrev.cc, src/ltlvisit/lunabbrev.hh,
src/ltlvisit/mark.cc, src/ltlvisit/mark.hh, src/ltlvisit/nenoform.cc,
src/ltlvisit/nenoform.hh, src/ltlvisit/postfix.cc,
src/ltlvisit/postfix.hh, src/ltlvisit/randomltl.cc,
src/ltlvisit/randomltl.hh, src/ltlvisit/reduce.cc,
src/ltlvisit/reduce.hh, src/ltlvisit/relabel.cc,
src/ltlvisit/relabel.hh, src/ltlvisit/simpfg.cc,
src/ltlvisit/simpfg.hh, src/ltlvisit/simplify.cc,
src/ltlvisit/simplify.hh, src/ltlvisit/snf.cc, src/ltlvisit/snf.hh,
src/ltlvisit/tostring.cc, src/ltlvisit/tostring.hh,
src/ltlvisit/tunabbrev.cc, src/ltlvisit/tunabbrev.hh,
src/ltlvisit/wmunabbrev.cc, src/ltlvisit/wmunabbrev.hh,
src/misc/Makefile.am, src/misc/acccompl.cc, src/misc/acccompl.hh,
src/misc/accconv.cc, src/misc/accconv.hh, src/misc/bareword.cc,
src/misc/bareword.hh, src/misc/bddalloc.cc, src/misc/bddalloc.hh,
src/misc/bddlt.hh, src/misc/bddop.cc, src/misc/bddop.hh,
src/misc/casts.hh, src/misc/escape.cc, src/misc/escape.hh,
src/misc/fixpool.hh, src/misc/freelist.cc, src/misc/freelist.hh,
src/misc/hash.hh, src/misc/hashfunc.hh, src/misc/intvcmp2.cc,
src/misc/intvcmp2.hh, src/misc/intvcomp.cc, src/misc/intvcomp.hh,
src/misc/ltstr.hh, src/misc/memusage.cc, src/misc/memusage.hh,
src/misc/minato.cc, src/misc/minato.hh, src/misc/modgray.cc,
src/misc/modgray.hh, src/misc/mspool.hh, src/misc/optionmap.cc,
src/misc/optionmap.hh, src/misc/random.cc, src/misc/random.hh,
src/misc/timer.cc, src/misc/timer.hh, src/misc/unique_ptr.hh,
src/misc/version.cc, src/misc/version.hh, src/neverparse/Makefile.am,
src/neverparse/fmterror.cc, src/neverparse/neverclaimparse.yy,
src/neverparse/neverclaimscan.ll, src/neverparse/parsedecl.hh,
src/neverparse/public.hh, src/saba/Makefile.am,
src/saba/explicitstateconjunction.cc,
src/saba/explicitstateconjunction.hh, src/saba/saba.cc,
src/saba/saba.hh, src/saba/sabacomplementtgba.cc,
src/saba/sabacomplementtgba.hh, src/saba/sabastate.hh,
src/saba/sabasucciter.hh, src/sabaalgos/Makefile.am,
src/sabaalgos/sabadotty.cc, src/sabaalgos/sabadotty.hh,
src/sabaalgos/sabareachiter.cc, src/sabaalgos/sabareachiter.hh,
src/sabatest/Makefile.am, src/sabatest/defs.in,
src/sabatest/sabacomplementtgba.cc, src/sanity/Makefile.am,
src/sanity/readme.test, src/sanity/style.test, src/ta/Makefile.am,
src/ta/ta.cc, src/ta/ta.hh, src/ta/taexplicit.cc,
src/ta/taexplicit.hh, src/ta/taproduct.cc, src/ta/taproduct.hh,
src/ta/tgta.cc, src/ta/tgta.hh, src/ta/tgtaexplicit.cc,
src/ta/tgtaexplicit.hh, src/ta/tgtaproduct.cc, src/ta/tgtaproduct.hh,
src/taalgos/Makefile.am, src/taalgos/dotty.cc, src/taalgos/dotty.hh,
src/taalgos/emptinessta.cc, src/taalgos/emptinessta.hh,
src/taalgos/minimize.cc, src/taalgos/minimize.hh,
src/taalgos/reachiter.cc, src/taalgos/reachiter.hh,
src/taalgos/statessetbuilder.cc, src/taalgos/statessetbuilder.hh,
src/taalgos/stats.cc, src/taalgos/stats.hh, src/taalgos/tgba2ta.cc,
src/taalgos/tgba2ta.hh, src/tgba/Makefile.am, src/tgba/bdddict.cc,
src/tgba/bdddict.hh, src/tgba/bddprint.cc, src/tgba/bddprint.hh,
src/tgba/formula2bdd.cc, src/tgba/formula2bdd.hh,
src/tgba/futurecondcol.cc, src/tgba/futurecondcol.hh,
src/tgba/public.hh, src/tgba/sba.hh, src/tgba/state.hh,
src/tgba/statebdd.cc, src/tgba/statebdd.hh, src/tgba/succiter.hh,
src/tgba/succiterconcrete.cc, src/tgba/succiterconcrete.hh,
src/tgba/taatgba.cc, src/tgba/taatgba.hh, src/tgba/tgba.cc,
src/tgba/tgba.hh, src/tgba/tgbabddconcrete.cc,
src/tgba/tgbabddconcrete.hh, src/tgba/tgbabddconcretefactory.cc,
src/tgba/tgbabddconcretefactory.hh,
src/tgba/tgbabddconcreteproduct.cc,
src/tgba/tgbabddconcreteproduct.hh, src/tgba/tgbabddcoredata.cc,
src/tgba/tgbabddcoredata.hh, src/tgba/tgbabddfactory.hh,
src/tgba/tgbaexplicit.cc, src/tgba/tgbaexplicit.hh,
src/tgba/tgbakvcomplement.cc, src/tgba/tgbakvcomplement.hh,
src/tgba/tgbaproduct.cc, src/tgba/tgbaproduct.hh,
src/tgba/tgbasafracomplement.cc, src/tgba/tgbasafracomplement.hh,
src/tgba/tgbascc.cc, src/tgba/tgbascc.hh, src/tgba/tgbasgba.cc,
src/tgba/tgbasgba.hh, src/tgba/tgbatba.cc, src/tgba/tgbatba.hh,
src/tgba/tgbaunion.cc, src/tgba/tgbaunion.hh, src/tgba/wdbacomp.cc,
src/tgba/wdbacomp.hh, src/tgbaalgos/Makefile.am,
src/tgbaalgos/bfssteps.cc, src/tgbaalgos/bfssteps.hh,
src/tgbaalgos/cutscc.cc, src/tgbaalgos/cutscc.hh,
src/tgbaalgos/cycles.cc, src/tgbaalgos/cycles.hh,
src/tgbaalgos/degen.cc, src/tgbaalgos/degen.hh,
src/tgbaalgos/dotty.cc, src/tgbaalgos/dotty.hh,
src/tgbaalgos/dottydec.cc, src/tgbaalgos/dottydec.hh,
src/tgbaalgos/dupexp.cc, src/tgbaalgos/dupexp.hh,
src/tgbaalgos/eltl2tgba_lacim.cc, src/tgbaalgos/eltl2tgba_lacim.hh,
src/tgbaalgos/emptiness.cc, src/tgbaalgos/emptiness.hh,
src/tgbaalgos/emptiness_stats.hh, src/tgbaalgos/gtec/Makefile.am,
src/tgbaalgos/gtec/ce.cc, src/tgbaalgos/gtec/ce.hh,
src/tgbaalgos/gtec/explscc.cc, src/tgbaalgos/gtec/explscc.hh,
src/tgbaalgos/gtec/gtec.cc, src/tgbaalgos/gtec/gtec.hh,
src/tgbaalgos/gtec/nsheap.cc, src/tgbaalgos/gtec/nsheap.hh,
src/tgbaalgos/gtec/sccstack.cc, src/tgbaalgos/gtec/sccstack.hh,
src/tgbaalgos/gtec/status.cc, src/tgbaalgos/gtec/status.hh,
src/tgbaalgos/gv04.cc, src/tgbaalgos/gv04.hh, src/tgbaalgos/isdet.cc,
src/tgbaalgos/isdet.hh, src/tgbaalgos/isweakscc.cc,
src/tgbaalgos/isweakscc.hh, src/tgbaalgos/lbtt.cc,
src/tgbaalgos/lbtt.hh, src/tgbaalgos/ltl2taa.cc,
src/tgbaalgos/ltl2taa.hh, src/tgbaalgos/ltl2tgba_fm.cc,
src/tgbaalgos/ltl2tgba_fm.hh, src/tgbaalgos/ltl2tgba_lacim.cc,
src/tgbaalgos/ltl2tgba_lacim.hh, src/tgbaalgos/magic.cc,
src/tgbaalgos/magic.hh, src/tgbaalgos/minimize.cc,
src/tgbaalgos/minimize.hh, src/tgbaalgos/ndfs_result.hxx,
src/tgbaalgos/neverclaim.cc, src/tgbaalgos/neverclaim.hh,
src/tgbaalgos/postproc.cc, src/tgbaalgos/postproc.hh,
src/tgbaalgos/powerset.cc, src/tgbaalgos/powerset.hh,
src/tgbaalgos/projrun.cc, src/tgbaalgos/projrun.hh,
src/tgbaalgos/randomgraph.cc, src/tgbaalgos/randomgraph.hh,
src/tgbaalgos/reachiter.cc, src/tgbaalgos/reachiter.hh,
src/tgbaalgos/reducerun.cc, src/tgbaalgos/reducerun.hh,
src/tgbaalgos/reductgba_sim.cc, src/tgbaalgos/reductgba_sim.hh,
src/tgbaalgos/replayrun.cc, src/tgbaalgos/replayrun.hh,
src/tgbaalgos/rundotdec.cc, src/tgbaalgos/rundotdec.hh,
src/tgbaalgos/safety.cc, src/tgbaalgos/safety.hh,
src/tgbaalgos/save.cc, src/tgbaalgos/save.hh, src/tgbaalgos/scc.cc,
src/tgbaalgos/scc.hh, src/tgbaalgos/sccfilter.cc,
src/tgbaalgos/sccfilter.hh, src/tgbaalgos/se05.cc,
src/tgbaalgos/se05.hh, src/tgbaalgos/simulation.cc,
src/tgbaalgos/simulation.hh, src/tgbaalgos/stats.cc,
src/tgbaalgos/stats.hh, src/tgbaalgos/tau03.cc,
src/tgbaalgos/tau03.hh, src/tgbaalgos/tau03opt.cc,
src/tgbaalgos/tau03opt.hh, src/tgbaalgos/weight.cc,
src/tgbaalgos/weight.hh, src/tgbaparse/Makefile.am,
src/tgbaparse/fmterror.cc, src/tgbaparse/parsedecl.hh,
src/tgbaparse/public.hh, src/tgbaparse/tgbaparse.yy,
src/tgbaparse/tgbascan.ll, src/tgbatest/Makefile.am,
src/tgbatest/babiak.test, src/tgbatest/bddprod.test,
src/tgbatest/complementation.cc, src/tgbatest/complementation.test,
src/tgbatest/cycles.test, src/tgbatest/defs.in,
src/tgbatest/degendet.test, src/tgbatest/degenid.test,
src/tgbatest/dfs.test, src/tgbatest/dupexp.test,
src/tgbatest/eltl2tgba.test, src/tgbatest/emptchk.test,
src/tgbatest/emptchke.test, src/tgbatest/emptchkr.test,
src/tgbatest/explicit.cc, src/tgbatest/explicit.test,
src/tgbatest/explicit2.cc, src/tgbatest/explicit2.test,
src/tgbatest/explpro2.test, src/tgbatest/explpro3.test,
src/tgbatest/explpro4.test, src/tgbatest/explprod.cc,
src/tgbatest/explprod.test, src/tgbatest/intvcmp2.cc,
src/tgbatest/intvcomp.cc, src/tgbatest/intvcomp.test,
src/tgbatest/kv.test, src/tgbatest/ltl2neverclaim.test,
src/tgbatest/ltl2ta.test, src/tgbatest/ltl2tgba.cc,
src/tgbatest/ltl2tgba.test, src/tgbatest/ltlcounter.test,
src/tgbatest/ltlprod.cc, src/tgbatest/ltlprod.test,
src/tgbatest/mixprod.cc, src/tgbatest/mixprod.test,
src/tgbatest/neverclaimread.test, src/tgbatest/nondet.test,
src/tgbatest/obligation.test, src/tgbatest/powerset.cc,
src/tgbatest/randpsl.test, src/tgbatest/randtgba.cc,
src/tgbatest/randtgba.test, src/tgbatest/readsave.test,
src/tgbatest/renault.test, src/tgbatest/scc.test,
src/tgbatest/sccsimpl.test, src/tgbatest/spotlbtt.test,
src/tgbatest/spotlbtt2.test, src/tgbatest/taatgba.cc,
src/tgbatest/taatgba.test, src/tgbatest/tgbaread.cc,
src/tgbatest/tgbaread.test, src/tgbatest/tripprod.cc,
src/tgbatest/tripprod.test, src/tgbatest/wdba.test,
src/tgbatest/wdba2.test, wrap/Makefile.am, wrap/python/Makefile.am,
wrap/python/ajax/Makefile.am, wrap/python/ajax/spot.in,
wrap/python/buddy.i, wrap/python/spot.i,
wrap/python/tests/Makefile.am, wrap/python/tests/alarm.py,
wrap/python/tests/bddnqueen.py, wrap/python/tests/implies.py,
wrap/python/tests/interdep.py, wrap/python/tests/ltl2tgba.py,
wrap/python/tests/ltl2tgba.test, wrap/python/tests/ltlparse.py,
wrap/python/tests/ltlsimple.py, wrap/python/tests/minato.py,
wrap/python/tests/modgray.py, wrap/python/tests/optionmap.py,
wrap/python/tests/parsetgba.py, wrap/python/tests/run.in,
wrap/python/tests/setxor.py: Update licence version, and replace the
FSF address by a URL.

* src/ltlvisit/simplify.cc: Here.
* doc/tl/tl.tex: Document them.
* src/ltltest/reduccmp.test: Test them.

* src/ltlvisit/simplify.cc: Add them.
* src/ltltest/reduccmp.test: Check them.
* doc/tl/tl.tex: Document them.

* doc/tl/tl.tex, src/ltlvisit/simplify.cc: Fix the rule.
* src/ltltest/reduccmp.test, src/ltltest/syntimpl.test:
Add more tests.

* src/ltlvisit/simplify.cc (reduce_sere_ltl): Here.
* src/ltltest/reduccmp.test: Add a test case.

* src/ltlvisit/simplify.cc: Here.
* src/ltltest/reduccmp.test: Test them.
* doc/tl/tl.tex: Document them.

* src/ltlvisit/simplify.cc: Here.
* src/ltltest/reduccmp.test: Test it.
* doc/tl/tl.tex: Document it.

* src/ltlparse/ltlparse.yy: Make all the above operators
right-associative.  Also let `:' have precedence over `;'.
* src/ltltest/reduccmp.test: Adjust for the `:' precedence.
* doc/tl/tl.tex, NEWS: Document this.

* src/ltlvisit/simplify.cc: Here.
* src/ltltest/reduccmp.test: Test them.
* doc/tl/tl.tex: Document them.

* src/ltlvisit/simplify.cc (reduce_sere_ltl): New function,
to factor the code of the []-> and <>-> rewrittings.
* src/ltltest/reduccmp.test: Add more tests.
* doc/tl/tl.tex: Document these rewritings.

* src/ltlvisit/simplify.cc: Here.
* doc/tl/tl.tex: Document then.
* src/ltlast/bunop.hh (as_KleenStar): New helper function.
* src/ltltest/reduccmp.test: Add more tests.
* src/ltltest/reduc.cc: Also display the resulting formula
without reduce_size_stricly.

* src/ltlvisit/snf.cc, src/ltlvisit/snf.hh: New files.
* src/ltlvisit/Makefile.am: Distribute them.
* src/ltlvisit/simplify.cc, src/ltlvisit/simplify.hh: Call snf(f) for
all f[*].
* src/ltltest/reduccmp.test: Test it.
* doc/tl/tl.tex, doc/tl/tl.bib: Document it.

* src/ltlvisit/simplify.cc: Here.
* src/ltltest/reduccmp.test: More tests.
* doc/tl/tl.tex: Document them.

* src/ltlast/multop.hh, src/ltlast/multop.cc (all_but): New method
used to simplify the removal of one element of a multop.
* src/ltlvisit/simplify.cc: Implement the new rewriting rules.
* doc/tl/tl.tex: Document them.
* src/ltltest/reduccmp.test: Test them.

* src/ltlvisit/simplify.hh (ltl_simplifier_options): New option
reduce_size_stricly.
* src/ltlvisit/simplify.cc (simplify_visitor): Implement these
rules.
* src/ltltest/reduc.cc: Check with reduce_size_strictly unset or
set, but only use the latter result to check sizes.
* src/ltltest/reduccmp.test: Test them.
* doc/tl/tl.tex: Document them.

* src/ltlvisit/simplify.cc: Add new rules.
* doc/tl/tl.tex: Document them.
* src/ltltest/reduccmp.test: Add test cases.

The actual rules are a bit more complex:
a & X(G(a&b...)&c...) = Ga & X(G(b...)&c...)
a | X(Fa | c) = F(a) | c
with the second rule being applied only if all XF can
be removed.  See the documentation for an example.

* src/ltlvisit/simplify.cc: Implement these new rules.
* doc/tl/tl.tex: Document them.
* src/ltltest/reduccmp.test: Add test cases.

* src/ltlvisit/simplify.cc: Implement these rules.
* src/ltltest/reduccmp.test: Add tests.
* doc/tl/tl.tex: Document them.

* src/ltlvisit/simplify.cc: Implement them here, and augment them
to support M, and W operators.
* src/ltltest/reduccmp.test: Add some tests.
* doc/tl/tl.tex (Simplifications Based on Implications): Document
these rules.
* doc/tl/tl.bib (babiak.12.tacas): New entry.

* src/ltlvisit/simplify.cc: Add four rules.
* doc/tl/tl.tex: Document these rules.
* src/ltltest/reduccmp.test: Add tests.

* doc/tl/tl.tex: Document the rules.
* src/ltlvisit/simplify.cc (simplify_visitor): Implement them.
* src/ltltest/reduccmp.test: Test them.

* src/ltlvisit/simplify.cc (simplify_visitor): Do it.
* src/ltltest/reduccmp.test: Add a test.
* doc/tl/tl.tex: Document it.
* src/ltlast/multop.cc: Fix the computation of is.accepting_eword
for Fusion.  The Fusion operator never accepts [*0].

* src/ltlvisit/simplify.cc (simplify_visitor): Do it.
* src/ltltest/reduccmp.test: Add more tests.
* doc/tl/tl.tex: Document it.

This fixes a bug where {(a&!a)[=2]} was translated either into an
universal automaton (with simplification turned off) or in an
empty automaton (with simplification turned on).

* src/tgbaalgos/ltl2tgba_fm.cc (ratexp_to_dfa::translate): Trim
the automaton.
(ratexp_to_dfa::succ, ratexp_to_dfa::get_label): Deal with trimed
states.
(ltl_trad_visitor::visit(unop::Closure)): Likewise.
* src/tgbatest/ltl2tgba.test, src/ltltest/reduccmp.test: New test
cases.

* src/ltlvisit/simplify.cc (syntactic_implication_aux): Refine
rules to deal with pure eventualities and purely universal
properties.
* src/ltltest/reduccmp.test: Add tests.

* src/tgbaalgos/ltl2tgba_fm.cc (ratexp_trad_visitor::visit): Fix
the translation of the Goto operator.
(ratexp_trad_visitor::next_to_concat): More comments.
* src/ltltest/reduccmp.test: Add a test case.

* src/ltlvisit/simplify.hh
(ltl_simplifier::negative_normal_form): Allow logical
unabbreviations during the NNF pass.
* src/ltlvisit/simplify.cc
(ltl_simplifier::negative_normal_form)
(negative_normal_form_visitor): Adjust.
(ltl_simplifier::simplify): Request unabbreviations.
* src/ltlvisit/reduce.cc (reduce): Remove most
of the code, leaving only a call ltl_simplifier
and some wrapper code to convert options.
* src/ltltest/reduccmp.test: Add more test cases.

* src/ltlvisit/simplify.cc (ltl_simplifier): Adjust
code.
* src/ltltest/reduccmp.test: Add some test cases.

* src/ltlvisit/simplify.cc (ltl_simplifier): Add more rewritings
for formulae that are both universal and eventual.
* src/ltltest/reduccmp.test: Add six more cases.

* src/ltltest/reduccmp.test: Add the test.

* src/ltlvisit/simplify.cc (ltl_simplifier): Since we are processing
the formula bottom-up, don't assume all trivial simplification have
been done.
* src/ltltest/reduccmp.test: More tests.

So far I have only checked these rewritings with reduccmp.test.
There are probably a few kinks to iron out.

* src/ltlvisit/simplify.cc: Reimplement most of the basic
rewriting rules, leaving some FIXME comments for dubious ones.
* src/ltlast/multop.cc, src/ltlast/multop.hh: Ignore NULL
pointers in the vector.
* src/ltlvisit/reduce.cc (reduce): Do not call basic_reduce().
* src/ltltest/reduccmp.test: Adjust tests.

* src/ltlvisit/reduce.cc (reduce_visitor): Always reduce "a M b"
to "a & b" if "a" is a pure eventual formula, remove the
constraint on "b".
* src/ltltest/reduccmp.test: Add two tests.