so it doesn't have to compute it.
* src/tgbaparse/tgbascan.ll: Likewise.
(YY_USER_INIT, current_file): Remove, it is too costly to use
yy::Location::filename in the current implementation
of yy::Location (this attribute is duplicated for each token).
Leaving it empty divides the parsing time by 3.
* src/tgbaparse/fmterror.cc, src/tgbaparse/public.hh
(format_tgba_parse_errors): Take the filename as argument.
* src/tgbatest/explprod.cc, src/tgbatest/ltl2tgba.cc,
src/tgbatest/mixprod.cc, src/tgbatest/powerset.cc,
src/tgbatest/readsave.cc, src/tgbatest/reductgba.cc,
src/tgbatest/tgbaread.cc, src/tgbatest/tripprod.cc,
iface/gspn/dottyssp.cc, iface/gspn/ltlgspn.cc: Adjust calls
to format_tgba_parse_errors.
class gspn_environment, and move it to ...
* src/ltlenv/declenv.cc, src/ltlenv/declenv.hh: .. this new file
as class declarative_environment.
* src/ltlenv/Makefile.am (ltlenv_HEADERS): Add declenv.hh.
(libltlenv_la_SOURCES): Add declenv.cc.
* iface/gspn/dottygspn.cc, iface/gspn/dottyssp.cc,
iface/gspn/gspn.cc, iface/gspn/gspn.hh, iface/gspn/ltlgspn.cc,
iface/gspn/ssp.cc, iface/gspn/ssp.hh: Adjust references
to declarative_environment.
* iface/gspn/eesrg.cc, iface/gspn/eesrg.hh,
iface/gspn/dottyeesrg.cc: Rename as ...
* iface/gspn/ssp.cc, iface/gspn/ssp.hh, iface/gspn/dottyssp.cc:
... these. Adjust all classes and function names.
* iface/gspn/ltlgspn.cc, iface/gspn/Makefile.am: Adjust all classes
filenames and function names.
* m4/gspnlib.m4: Define WITH_GSPN_SSP and LIBGSPNSSP_LDFLAGS.
