avoid cast list elements, add more debug info, add Rubin's multi-module 'mod'example

git-svn-id: https://swig.svn.sourceforge.net/svnroot/swig/trunk/SWIG@8493 626c5289-ae23-0410-ae9c-e8d60b6d4f22

Examples/test-suite/mod_a.i

@@ -0,0 +1,24 @@
+%module mod_a
+
+%{
+#include "mod.h"
+%}
+
+
+class C;
+
+class A
+{
+public:
+    A() {}
+    C* GetC() { return NULL; }
+
+    void DoSomething(A* a) {}
+};
+
+
+class B : public A
+{
+public:
+    B();
+};