Merged changes in the trunk up to revision 52340.

Conflicts resolved:
source/blender/blenloader/intern/readfile.c

source/blender/python/generic/bpy_internal_import.c

@@ -59,6 +59,19 @@ static PyMethodDef bpy_reload_meth;
 static PyObject   *imp_reload_orig = NULL;
 
 /* 'builtins' is most likely PyEval_GetBuiltins() */
+
+/**
+ * \note to the discerning developer, yes - this is nasty
+ * monkey-patching our own import into Python's builtin 'imp' module.
+ *
+ * However Python's alternative is to use import hooks,
+ * which are implemented in a way that we can't use our own importer as a
+ * fall-back (instead we must try and fail - raise an exception evert time).
+ * Since importing from blenders text-blocks is not the common case
+ * I prefer to use Pythons import by default and fall-back to
+ * Blenders - which we can only do by intercepting import calls I'm afraid.
+ * - Campbell
+ */
 void bpy_import_init(PyObject *builtins)
 {
 	PyObject *item;