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values.

Before this change states were numbered using positive values and
SCCs using negative values.  That meant the user had to work with
negative values.  With this changes, the nonnegative values used
to label SCCs can also directly be used as index in the scc_map_.

* src/tgbaalgos/scc.hh (scc_map::scc_of_state,
scc_map::cond_set_of, scc_map::acc_set_of, scc_map::states_of,
scc_map::initial, scc_map::scc_type, scc_map::succ,
scc_map::accepting): Adjust prototypes to take or return unsigned
arguments.
* src/tgbaalgos/scc.cc: Adjust prototypes of the above functions.
(scc_map::build_map, scc_map::relabel_component): Number states
using negative values, and SCCs using nonnegative values.
(dump_scc_dot): Adjust to use nonnegative values.

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.