new function RNA_warning(), replaces printf with function which may be called via python.

Now this gives the line number of the scripts thats running, eg:

uiItemFullO: unknown operator 'some.operator'
/c/bin/2.56/scripts/startup/bl_ui/space_view3d_toolbar.py:73

source/blender/python/generic/py_capi_utils.h

@@ -47,4 +47,5 @@ void			PyC_RunQuicky(const char *filepath, int n, ...);
 
 void PyC_MainModule_Backup(PyObject **main_mod);
 void PyC_MainModule_Restore(PyObject *main_mod);
+
 #endif // PY_CAPI_UTILS_H