kripke: rename state_acceptance_conditions

* spot/kripke/kripke.cc, spot/kripke/kripke.hh,
spot/kripke/fairkripke.hh (state_acceptance_conditions): Rename as...
(state_acceptance_mark): ... this.
* NEWS: Mention it.

NEWS

@@ -146,6 +146,11 @@ New in spot 2.0.3a (not yet released)
     spot::internal::twa_succ_iterable to make it clear this is not for
     public consumption.
 
+  * spot::fair_kripke::state_acceptance_conditions() renamed to
+    spot::fair_kripke::state_acceptance_mark() for consistency.  This
+    is backward incompatible, but we are not aware of any actual use
+    of this method.
+
   Python:
 
   * The __format__() method for formula supports the same

spot/kripke/fairkripke.hh

@@ -97,8 +97,8 @@ namespace spot
     /// This should be a conjunction of atomic propositions.
     virtual bdd state_condition(const state* s) const = 0;
 
-    /// \brief The set of acceptance conditions that label the state \a s.
+    /// \brief The acceptance mark that labels state \a s.
     virtual acc_cond::mark_t
-      state_acceptance_conditions(const state* s) const = 0;
+      state_acceptance_mark(const state* s) const = 0;
   };
 }

spot/kripke/kripke.cc

 // -*- coding: utf-8 -*-
-// Copyright (C) 2009, 2010, 2014 Laboratoire de Recherche et
+// Copyright (C) 2009, 2010, 2014, 2016 Laboratoire de Recherche et
 // Developpement de l'Epita
 //
 // This file is part of Spot, a model checking library.
@@ -47,7 +47,7 @@ namespace spot
   }
 
   acc_cond::mark_t
-  kripke::state_acceptance_conditions(const state*) const
+  kripke::state_acceptance_mark(const state*) const
   {
     return 0U;
   }

spot/kripke/kripke.hh

@@ -98,7 +98,7 @@ namespace spot
     virtual ~kripke();
 
     virtual
-      acc_cond::mark_t state_acceptance_conditions(const state*) const override;
+      acc_cond::mark_t state_acceptance_mark(const state*) const override;
   };
 
   typedef std::shared_ptr<kripke> kripke_ptr;