Add discard and add methods to std::set and std::multiset wrappers so that pyabc.i can be used ensuring MutableSet is a valid abstract base class

git-svn-id: https://swig.svn.sourceforge.net/svnroot/swig/trunk@13619 626c5289-ae23-0410-ae9c-e8d60b6d4f22

Lib/python/std_set.i

@@ -49,6 +49,14 @@
        return *(swig::cgetpos(self, i));
      }
 
+     void add(value_type x) {
+       self->insert(x);
+     }
+
+     void discard(value_type x) {
+       self->erase(x);
+     }
+
   };
 %enddef