added refptr<T>::operator=(const T * ptr) method, including refptr in parser

git-svn-id: svn://anubis/fart/trunk@93 7f9b0f55-74a9-4bce-be96-3c2cd072584d

test/tests.cc

@@ -30,6 +30,8 @@ int main()
     refptr<S> brp(b);
     cout << "Going to assign brp to arp" << endl;
     arp = brp;
+    cout << "Going to assign a new S to arp" << endl;
+    arp = new S(21);
     cout << "ok, exiting" << endl;
     return 0;
 }