* spot/twa/acc.hh: Remove colors_inf_conj and colors_fin_disj
(unused) and moved get_alone_mark (now find_unit_clause),
propagate_fin_inf (now unit_propagation) and has_parity_prefix
to acc.cc.
* spot/twa/acc.cc: Use a new implementation of unit_propagation
and find_unit_clause.
* spot/twaalgos/cleanacc.cc: Use the new name of
propagate_fin_inf.