rename set_single_acceptance_set() to set_buchi()

Fixes #66.

* src/dstarparse/dra2ba.cc, src/dstarparse/nra2nba.cc,
src/hoaparse/hoaparse.yy, src/tgba/tgbagraph.hh,
src/tgbaalgos/complete.cc, src/tgbaalgos/degen.cc,
src/tgbaalgos/dtbasat.cc, src/tgbaalgos/dtgbacomp.cc,
src/tgbaalgos/minimize.cc, src/tgbaalgos/postproc.cc: Here.

src/dstarparse/dra2ba.cc

@@ -225,7 +225,7 @@ namespace spot
       {
 	out_->copy_ap_of(a->aut);
 	out_->prop_state_based_acc();
-	acc_ = out_->set_single_acceptance_set();
+	acc_ = out_->set_buchi();
 	out_->new_states(num_states_ * (a->accpair_count + 1));
 	out_->set_init_state(a->aut->get_init_state_number());
 

src/dstarparse/nra2nba.cc

@@ -45,7 +45,7 @@ namespace spot
 	num_states_(a->aut->num_states())
       {
 	out_->copy_ap_of(aut);
-	out_->set_single_acceptance_set();
+	out_->set_buchi();
 	out_->prop_state_based_acc();
 	out_->new_states(num_states_ * (d_->accpair_count + 1));
 	// This converts the initial state of aut (not a->aut) into a

src/hoaparse/hoaparse.yy

@@ -1042,7 +1042,7 @@ incorrectly-labeled-edge: trans-label unlabeled-edge
 /**********************************************************************/
 
 never: "never" { res.namer = res.h->aut->create_namer<std::string>();
-	         res.h->aut->set_single_acceptance_set();
+	         res.h->aut->set_buchi();
 		 res.h->aut->prop_state_based_acc();
 		 res.acc_state = State_Acc;
 		 res.pos_acc_sets = res.h->aut->acc().all_sets();

src/tgba/tgbagraph.hh

@@ -348,7 +348,7 @@ namespace spot
       acc_.set_generalized_buchi();
     }
 
-    acc_cond::mark_t set_single_acceptance_set()
+    acc_cond::mark_t set_buchi()
     {
       set_generalized_buchi(1);
       return acc_.mark(0);

src/tgbaalgos/complete.cc

@@ -31,7 +31,7 @@ namespace spot
 	// We cannot safely complete an automaton if it has no
 	// acceptance set as the added sink would become accepting.
 	// In this case, add an acceptance set to all transitions.
-	allacc = aut->set_single_acceptance_set();
+	allacc = aut->set_buchi();
 	for (auto& t: aut->transition_vector())
 	  t.acc = allacc;
       }

src/tgbaalgos/degen.cc

@@ -201,7 +201,7 @@ namespace spot
       // The result automaton is an SBA.
       auto res = make_tgba_digraph(dict);
       res->copy_ap_of(a);
-      res->set_single_acceptance_set();
+      res->set_buchi();
       if (want_sba)
 	res->prop_state_based_acc();
       // Preserve determinism, weakness, and stutter-invariance

src/tgbaalgos/dtbasat.cc

@@ -638,7 +638,7 @@ namespace spot
       auto autdict = aut->get_dict();
       auto a = make_tgba_digraph(autdict);
       a->copy_ap_of(aut);
-      acc_cond::mark_t acc = a->set_single_acceptance_set();
+      acc_cond::mark_t acc = a->set_buchi();
       if (state_based)
 	a->prop_state_based_acc();
       a->new_states(satdict.cand_size);

src/tgbaalgos/dtgbacomp.cc

@@ -40,7 +40,7 @@ namespace spot
     // We will modify res in place, and the resulting
     // automaton will only have one acceptance set.
     // This changes aut->acc();
-    res->set_single_acceptance_set();
+    res->set_buchi();
     // The resulting automaton is weak.
     res->prop_inherently_weak();
     res->prop_state_based_acc();
@@ -127,7 +127,7 @@ namespace spot
 
     // We will modify res in place, and the resulting
     // automaton will only have one acceptance set.
-    acc_cond::mark_t all_acc = res->set_single_acceptance_set();
+    acc_cond::mark_t all_acc = res->set_buchi();
     res->prop_state_based_acc();
 
     unsigned sink = res->num_states();

src/tgbaalgos/minimize.cc

@@ -141,7 +141,7 @@ namespace spot
     // transition in res.
 
     if (!final->empty())
-      res->set_single_acceptance_set();
+      res->set_buchi();
 
     for (sit = sets.begin(); sit != sets.end(); ++sit)
       {

src/tgbaalgos/postproc.cc

@@ -40,7 +40,7 @@ namespace spot
     {
       if (a->acc().num_sets() == 0)
 	{
-	  auto m = a->set_single_acceptance_set();
+	  auto m = a->set_buchi();
 	  for (auto& t: a->transitions())
 	    t.acc = m;
 	}