tgba_explicit instances labelled by other objects than strings.

* src/tgba/tgbaexplicit.cc, src/tgba/tgbaexplicit.hh:
Split tgba_explicit in two levels: tgba_explicit with unlabelled
states, and tgba_explicit_labelled templated by the type of
the label.  Define tgba_explicit_string (with the interface
of the former tgba_explicit class) and tgba_explicit_formula
for future use in ltl2tgba.cc.
* src/tgba/tgbareduc.cc, src/tgba/tgbareduc.hh,
src/tgbaalgos/cutscc.cc, src/tgbaalgos/dupexp.cc,
src/tgbaalgos/emptiness.cc, src/tgbaalgos/ltl2tgba_fm.cc,
src/tgbaalgos/powerset.cc, src/tgbaalgos/randomgraph.cc,
src/tgbaparse/public.hh, src/tgbaparse/tgbaparse.yy,
src/tgbatest/explicit.cc, src/tgbatest/ltl2tgba.cc: Adjust to
use tgba_explicit_string when appropriate.

* src/ltlenv/environment.hh, src/ltlvisit/basicreduce.cc: Remove
useless FIXMEs.
* src/ltlvisit/reduce.cc (reduce_visitor::visit(binop)): Compute
syntactic implications only when needed.
* src/tgbaalgos/reductgba_sim_del.cc
(build_recurse_successor_spoiler): Remplace the FIXME by an assert.
* src/tgba/tgbareduc.cc: Reword some comments, discard old
commented code.

* bench/emptchk/ltl-human.sh, bench/emptchk/ltl-random.sh,
src/sanity/style.test, src/tgba/bdddict.cc,
src/tgba/succiterconcrete.hh, src/tgba/tgbabddcoredata.hh,
src/tgba/tgbareduc.cc, src/tgba/tgbareduc.hh,
src/tgbaalgos/gv04.cc, src/tgbaalgos/gv04.hh,
src/tgbaalgos/magic.cc, src/tgbaalgos/magic.hh,
src/tgbaalgos/se05.cc, src/tgbaalgos/se05.hh,
src/tgbaalgos/tau03.cc, src/tgbaalgos/tau03.hh,
src/tgbaalgos/tau03opt.cc, src/tgbaalgos/tau03opt.hh,
src/tgbatest/dfs.test: Replace them by "acceptance condition".

matter, for consistency.
* src/tgbaalgos/tarjan_on_fly.cc, iface/gspn/ssp.cc,
src/tgbaalgos/reductgba_sim_del.cc, src/tgbaalgos/reductgba_sim.cc,
src/tgbaalgos/minimalce.cc, src/tgba/tgbareduc.cc: Adjust.

src/tgbatest/reductgba.cc,
src/tgbatest/ltl2tgba.cc:
Add option for reduction of TGBA.

* src/tgbatest/emptchk.test, src/tgbaalgos/Makefile.am,
src/tgbaalgos/tarjan_on_fly.hh, src/tgbaalgos/tarjan_on_fly.cc,
src/tgbaalgos/nesteddfs.hh, src/tgbaalgos/nesteddfs.cc,
src/tgbaalgos/minimalce.hh, src/tgbaalgos/minimalce.cc,
src/tgbaalgos/colordfs.hh, src/tgbaalgos/colordfs.cc:
Remove some bugs.

src/tgbaalgos/gtec/ce.cc:
Modification of construction of counter example.

* src/tgbaalgos/reductgba_sim.hh src/tgbaalgos/reductgba_sim.cc,
src/tgbaalgos/reductgba_sim_del.cc,
src/tgba/tgbareduc.hh, src/tgba/tgbareduc.cc:
Modification for delayed simulation.


* src/tgbaalgos/gtec/ce.hh,
* src/tgbatest/ltl2tgba.cc,

src/tgbaalgos/tarjan_on_fly.cc,
src/tgbaalgos/nesteddfs.hh,
src/tgbaalgos/nesteddfs.cc,
src/tgbaalgos/minimalce.hh,
src/tgbaalgos/minimalce.cc,
src/tgbaalgos/colordfs.hh,
src/tgbaalgos/colordfs.cc: four new algorithms for emptyness check.

src/tgbaalgos/gtec/ce.hh,
src/tgbaalgos/gtec/ce.cc: Adapt the counter exemple for the ce
object in minimalce.hh.

src/tgbatest/ltl2tgba.cc,
src/tgbatest/emptchk.test,
src/tgbaalgos/Makefile.am: Add files for emptyness-check.


* src/tgbaalgos/reductgba_sim_del.cc: Restrict to degeneralize automata.
* src/tgba/tgbareduc.hh: src/tgba/tgbareduc.cc: Merge transition
for scc reduce.

src/tgbaalgos/reductgba_sim.cc,	src/tgbaalgos/reductgba_sim.hh,
src/tgbaalgos/reductgba_sim_del.cc: Remove some comments.

* src/tgbatest/ltl2tgba.cc, src/tgbatest/reductgba.cc: Adjust ...
* src/tgbatest/spotlbtt.test: More test (delayed simulation)

* src/tgbatest/reductgba.test: More Test.

* src/tgbatest/ltl2tgba.cc: Adjust ...
* src/tgbaalgos/reductgba_sim_del.cc, src/tgbaalgos/reductgba_sim.hh,
src/tgbaalgos/reductgba_sim.cc: try to optimize.

* src/tgba/tgbareduc.hh, src/tgba/tgbareduc.cc: Scc reduction
and we remove some acceptance condition in scc which are not accepting.
* src/ltlvisit/syntimpl.cc : Some case wasn't detect.
* src/ltlvisit/basicreduce.cc: Case FGa || FGb = F(Ga | Gb) added.
* src/ltltest/syntimpl.test: More Test.
* src/ltltest/syntimpl.cc: Put the formula in negative normal form.

src/tgbaalgos/reductgba_sim.cc, src/tgbaalgos/reductgba_sim.hh
src/tgbaalgos/reductgba_sim_del.cc, src/tgbatest/reduccmp.test,
src/tgbatest/reductgba.cc: 80 columns and style.

src/tgbaalgos/reductgba_sim.hh, src/tgbaalgos/reductgba_sim.cc:
bug in delayed simulation.

* src/tgbatest/reduccmp.test, src/tgbatest/reductgba.test,
src/tgba/tgbareduc.cc: bug in scc reduction.

There is bug in reduction with scc.
* src/tgbatest/reduccmp.test: More test.

* src/tgbatest/reductgba.test: Wrong test are removed.

with scc and delayed simulation.

* src/tgbatest/ltl2tgba.cc: Adjust parameters.
* src/tgbatest/reductgba.cc, src/tgbatest/Makefile.am: More Test.
* src/tgbaalgos/reductgba_sim_del.cc: Not finish, lot of bugs.
* src/tgbaalgos/reductgba_sim.hh, src/tgbaalgos/reductgba_sim.cc:
Remove some useless comments.
* src/tgba/tgbareduc.cc, src/tgba/tgbareduc.hh: Bug in SCC.

* src/ltlvisit/reducform.cc: Correct some bug for multop.
* src/ltltest/reduccmp.test: More Test.
* src/ltltest/reduc.cc: Thinko
* src/ltltest/equals.cc: Reduction compare

automata.
* src/tgbatest/spotlbtt.test, src/tgbatest/Makefile.am: Add some
test for reduction of automata.
* src/tgbaalgos/reductgba_sim_del.cc, src/tgbaalgos/reductgba_sim.cc,
src/tgbaalgos/reductgba_sim.hh: Compute some simulation relation
to reduce a tgba.
* src/tgba/tgbareduc.cc, src/tgba/tgbareduc.hh: A implementation
of tgba for the reduction.
* src/tgbaalgos/Makefile.am, src/tgba/Makefile.am:
Add the reduction of automata.
* src/ltlvisit/syntimpl.cc, src/ltlvisit/basereduc.cc:
Lot of mistake are corrected.
* src/ltlvisit/syntimpl.hh, src/ltlvisit/reducform.cc,
src/ltlvisit/reducform.hh, src/ltltest/reduc.cc: Adjust.
* src/ltltest/equals.cc, src/ltltest/reduccmp.test,
src/ltltest/Makefile.am: Add a test for reduction.