point in using a map since the SCC are numbered in sequence.
* src/tgbaalgos/scc.hh (scc_map::relabel_component): Return the
number of the SCC instead of taking it as argument.
(scc_map::scc_num_): Delete this variable. scc_map_.size() gives
the same information.
(scc_map::scc_map_type): Define using std::vector instead of
std::map.
* src/tgbaalgos/scc.cc: Adjust all uses.
* src/tgbaalgos/scc.hh (scc_map::scc_of_state,
scc_map::cond_set_of, scc_map::acc_set_of, scc_map::states_of):
New functions.
(scc_map::scc::conds): New attribute.
(dump_scc_dot): Take an optional VERBOSE argument.
* src/tgbaalgos/scc.cc (scc_map::scc_of_state,
scc_map::cond_set_of, scc_map::acc_set_of, scc_map::states_of):
Implement these new functions.
(dump_scc_dot): Display number of states, conditions and
acceptance conditions, with VERBOSE is set.
(build_map): Fill the new scc_map::scc::cond field.
