* src/tgbaalgos/gtec/gtec.hh (couvreur99_check, couvreur99_check_shy):
Add the poprem option.
* src/tgbaalgos/gtec/gtec.cc: Implement it.
* src/tgbaalgos/gtec/sccstack.cc, src/tgbaalgos/gtec/sccstack.hh
(scc_stack::rem, scc_stack::clear_rem,
scc_stack::connected_component::rem): New.
* src/tgbatest/ltl2tgba.cc, src/tgbatest/randtgba.cc: Add rem variants.

(index_and_insert): New function.
* src/tgbaalgos/gtec/gtec.cc (couvreur99_check_shy::check): Rewrite.
(couvreur99_check_shy::clear_todo): New method.
* src/tgbaalgos/gtec/gtec.hh (couvreur99_check_shy::todo_item): New
struct.
* iface/gspn/ssp.cc (numbered_state_heap_ssp_semi::index_and_insert):
New method.

(couvreur99_check_shy::couvreur99_check_shy): Add the group option,
and redefine todo as a list so it can be iterated over.
* src/tgbatest/ltl2tgba.cc, src/tgbatest/randtgba.cc: Introduce
couvreur99_shy- (for group=false) in addition to couvreur99_shy
(for group=true).
* iface/gspn/ssp.cc (couvreur99_check_ssp_shy_semi,
couvreur99_check_ssp_shy): Use group=true;

src/tgbaalgos/weight.hh: New files.
* src/tgbaalgos/Makefile.am: Add them.
* src/tgbaalgos/magic.cc, src/tgbaalgos/se05.cc,
src/tgbaalgos/tau03.cc, src/tgbaalgos/tau03opt.cc,
src/tgbaalgos/gtec/gtec.cc, src/tgbaalgos/gtec/status.cc,
src/tgbaalgos/gtec/status.hh, : Add emptiness check statistics
capability.
* src/tgbatest/randtgba.cc: Print these statistics.
* src/tgbatest/ltl2tgba.cc: tau03opt search can deal without acceptance
condition.
* src/tgbatest/emptchk.test: Test tau03opt search.

src/tgba/succiter.hh, src/tgba/succiterconcrete.hh,
src/tgba/tgba.hh, src/tgba/tgbabddconcrete.hh,
src/tgba/tgbabddconcreteproduct.hh, src/tgba/tgbaexplicit.hh,
src/tgba/tgbaproduct.hh, src/tgba/tgbareduc.hh,
src/tgba/tgbatba.hh, src/tgbaalgos/emptiness.hh,
src/tgbaalgos/magic.hh, src/tgbaalgos/replayrun.hh,
src/tgbaalgos/gtec/gtec.hh, iface/gspn/ssp.hh: Introduce Doxygen
groups in the documentation.  Presently this only covers the
tgba/ directory, and the emptiness-check algorithms.
* doc/Doxyfile.in (EXCLUDE_PATTERNS): Skip Bison-generated files
in src/evtgbaparse/.

src/tgbaalgos/gtec/gtec.hh (couvreur99_check::print_stats): New.
* src/tgbatest/ltl2tgba.cc: Print emptiness-check statistics.

algorithms to conform to it, uniformly.  This will unfortunately
break third-party code that were using these algorithms.
* src/tgbaalgos/emptiness.cc, src/tgbaalgos/emptiness.hh: New files.
* src/tgbaalgos/Makefile.am: New files.
* src/tgbaalgos/magic.cc, src/tgbaalgos/magic.hh: Adjust to
conform to the new emptiness-check interface.
* src/tgbaalgos/gtec/ce.cc, src/tgbaalgos/gtec/ce.hh,
src/tgbaalgos/gtec/gtec.cc, src/tgbaalgos/gtec/gtec.hh,
src/tgbaalgos/gtec/status.cc, src/tgbaalgos/gtec/status.hh:
Likewise.  The classes have been renamed are as following
  emptiness_check -> couvreur99_check
  emptiness_check_shy -> couvreur99_check_shy
  counter_example -> couvreur99_check_result
* src/tgbatest/ltl2tgba.cc, iface/gspn/ltlgspn.cc, iface/gspn/ssp.hh,
iface/gspn/ssp.cc: Adjust to renaming and new interface.

comments.
* iface/gspn/ssp.cc (emptiness_check_shy_ssp::find_state): Likewise.
Soheib and I had a hard time figuring why we did this...

Free filtered states.
(emptiness_check_shy_eesrg): New class.
(emptiness_check_eesrg_shy): New function.
* iface/gspn/eesrg.hh (emptiness_check_eesrg_shy): New function.
* iface/gspn/ltlgspn.cc (main) [EESRG]: Handle -e3, -e4, and -e5.
* * src/tgbaalgos/gtec/gtec.hh, src/tgbaalgos/gtec/gtec.cc
(emptiness_check_shy::check): Move arc, num, succ_queue, and todo
as attributes.
(emptiness_check_shy::find_state): New virtual function.

numbered_state_heap_hash_map_factory): New class.
* src/tgbaalgos/gtec/nsheap.cc (numbered_state_heap_hash_map_factory):
Implement it.
* src/tgbaalgos/gtec/gtec.hh (emptiness_check::emptiness_check,
emptiness_check_shy::emptiness_check_shy): Take a
numbered_state_heap_factory argument.
* tgbaalgos/gtec/status.hh
(emptiness_check_status::emptiness_check_status): Likewise.
(emptiness_check_status::h): Make it a numbered_state_heap*.
* src/tgbaalgos/gtec/ce.cc, tgbaalgos/gtec/gtec.cc,
tgbaalgos/gtec/status.cc: Adjust uses of ecs_->h.

Delete and split into ...
* 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: ...
these new files.
* src/tgbaalgos/gtec/Makefile.am: New file.
* src/tgbaalgos/Makefile.am (SUBDIRS, libtgbaalgos_la_LIBADD):
Recurse into gtec and link gtec/libgtec.la.
(tgbaalgos_HEADERS, libtgbaalgos_la_SOURCES): Remove emptinesscheck.hh
and emptinesscheck.cc.
* configure.ac: Output src/tgbalagos/gtec/Makefile.
* iface/gspn/ltlgspn.cc, src/tgbatest/ltl2tgba.cc: Update includes.
* README: Update tree description.