app_utils needs to be imported to module gnucash to be accessible

bindings/python/__init__.py

@@ -4,6 +4,7 @@
 # instead of
 # >>> from gnucash.gnucash_core import thingy
 from gnucash.gnucash_core import *
+from . import app_utils
 ##  @file
 #   @brief helper file for the importing of gnucash
 #   @author Mark Jenkins, ParIT Worker Co-operative <mark@parit.ca>