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_b.i

@@ -0,0 +1,22 @@
+%module mod_b
+
+%{
+#include "mod.h"
+%}
+
+
+%import mod_a.i
+
+
+class C : public B
+{
+public:
+    C() {}
+};
+
+
+class D : public C
+{
+public:
+    D() {}
+};