Migrate to use a local model for document comments. Closes gh-issue #233.

mayan/apps/document_comments/admin.py

@@ -0,0 +1,14 @@
+from __future__ import unicode_literals
+
+from django.contrib import admin
+
+from .models import Comment
+
+
+class CommentAdmin(admin.ModelAdmin):
+    date_hierarchy = 'submit_date'
+    list_display = ('document', 'submit_date', 'user', 'comment')
+    readonly_fields = ('document', 'submit_date', 'user', 'comment')
+
+
+admin.site.register(Comment, CommentAdmin)