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 solves name clashes 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_comments/apps.py

@@ -3,11 +3,11 @@ from __future__ import absolute_import, unicode_literals
 from django.apps import apps
 from django.utils.translation import ugettext_lazy as _
 
-from acls import ModelPermission
-from common import MayanAppConfig, menu_facet, menu_object, menu_sidebar
-from documents.search import document_page_search, document_search
-from events import ModelEventType
-from navigation import SourceColumn
+from mayan.apps.acls import ModelPermission
+from mayan.apps.common import MayanAppConfig, menu_facet, menu_object, menu_sidebar
+from mayan.apps.documents.search import document_page_search, document_search
+from mayan.apps.events import ModelEventType
+from mayan.apps.navigation import SourceColumn
 
 from .events import (
     event_document_comment_create, event_document_comment_delete
@@ -26,7 +26,7 @@ class DocumentCommentsApp(MayanAppConfig):
     app_url = 'comments'
     has_rest_api = True
     has_tests = True
-    name = 'document_comments'
+    name = 'mayan.apps.document_comments'
     verbose_name = _('Document comments')
 
     def ready(self):