Project: Switch to full app paths

Instead of inserting the path of the apps into the Python app,
the apps are now referenced by their full import path.

This app name claves with external or native Python libraries.
Example: Mayan statistics app vs. Python new statistics library.

Every app reference is now prepended with 'mayan.apps'.

Existing config.yml files need to be updated manually.

Signed-off-by: Roberto Rosario <roberto.rosario.gonzalez@gmail.com>

mayan/apps/document_states/classes.py

@@ -7,7 +7,7 @@ from django.apps import apps
 from django.utils import six
 from django.utils.encoding import force_text
 
-from common.classes import PropertyHelper
+from mayan.apps.common.classes import PropertyHelper
 
 __all__ = ('WorkflowAction',)
 logger = logging.getLogger(__name__)