0021014: EDF 1583 SMESH: Improvement of the Python Dump for the creation of groups

0021014: EDF 1583 SMESH: Improvement of the Python Dump for the creation of groups
1) fix dump of Filter_i::SetCriteria()
2)
+    void Filter_i::AddWaiter( TPredicateChangeWaiter* waiter );
+    void Filter_i::RemoveWaiter( TPredicateChangeWaiter* waiter );
3)
+  const char*        SMESH::FunctorTypeToString(SMESH::FunctorType ft);
+  SMESH::FunctorType SMESH::StringToFunctorType(const char*       str);