Better selection of the acceptance of the initial state in SBA.
* src/tgba/tgbatba.cc (tgba_sba_proxy::tgba_sba_proxy): Set cycle_start_ to start in the accepting layer of the degeneralized automaton if the initial state has an accepting self-loop. Otherwise, starts at the level of the first acceptance condition as previously. (tgba_sba_proxy::get_init_state): Use cycle_start_. * src/tgba/tgbatba.hh (tgba_tba_proxy::a_): Make it protected so that we can use it in tgba_sba_proxy::tgba_sba_proxy. (tgba_sba_proxy::cycle_start_, tgba_sba_proxy::get_init_state): Declare. * src/tgbatest/ltl2tgba.test: More tests.