Add an algorithm (from Couvreur) working on BDDs to reduce the
size of TGBAs represented as BDDs by deleting unaccepting SCCs. * src/eltlparse/eltlparse.yy: Remove a warning. * src/tgba/tgbabddconcrete.cc, src/tgba/tgbabddconcrete.hh, src/tgba/tgbabddcoredata.cc, src/tgba/tgbabddcoredata.hh: Add a new function delete_unaccepting_scc in both classes. * src/tgbatest/eltl2tgba.cc, src/tgbatest/spotlbtt.test: Use this new function in LaCIM for ELTL and bench it. * src/tgbatest/defs.in: Fix it. * bench/ltl2tgba/algorithms, bench/ltl2tgba/defs.in: Add LaCIM for ELTL in benchs.