[lib] Remove nb_clauses() call from the solver object

=> Not supported anymore since it is a private attribute of the C++ class
This feature is only used during tests so, not very important (?)

library/cadbiom/models/clause_constraints/mcl/CLUnfolder.py

@@ -942,7 +942,6 @@ class CLUnfolder(object):
         """
         @return: boolean
         """
-        LOGGER.debug("__constraints_satisfied ?")
         solver = CryptoMS()
         # Load Solver and all clauses
         self.__load_solver(solver)
@@ -951,8 +950,10 @@ class CLUnfolder(object):
         if self.__stats:
             if solver.nb_vars() > self.__nb_vars:
                 self.__nb_vars = solver.nb_vars()
-            if solver.nb_clauses() > self.__nb_clauses:
-                self.__nb_clauses = solver.nb_clauses()
+
+            # Starting from pycryptosat 5.2, nb_clauses() is a private attribute
+            #if solver.nb_clauses() > self.__nb_clauses:
+            #    self.__nb_clauses = solver.nb_clauses()
         # Is problem satisfiable ?
         return solver.is_satisfiable()
 
@@ -969,8 +970,9 @@ class CLUnfolder(object):
         if self.__stats:
             if solver.nb_vars() > self.__nb_vars:
                 self.__nb_vars = solver.nb_vars()
-            if solver.nb_clauses() > self.__nb_clauses:
-                self.__nb_clauses = solver.nb_clauses()
+            # Starting from pycryptosat 5.2, nb_clauses() is a private attribute
+            #if solver.nb_clauses() > self.__nb_clauses:
+            #    self.__nb_clauses = solver.nb_clauses()
 
         if LOGGER.getEffectiveLevel() == DEBUG:
             LOGGER.debug("__msolve_constraints :: vvars : " + str(vvars))