Merge branch 'hotfix/0.29.1'
Merge branch 'master' into develop
refactor/reorganize common modules.
More constance configs.
Use new constance configs in mongodb feeds.
Fix tags & origin in relational DB.
Move MailFeed to feed/ and create BaseFeed; make MailFeed polymorphic.
More constance.
Mail feed * template updates.
mail feed field rename.
Make choice fields a little more decent and easier to maintain/update/push to templates. django-choices was not retained, it's too much. A simple named tuple just does the job.
Intermediate commit for relational rewrite / port. Some basic things work (creating feeds, starting to refresh them, basic user oneTOone objects…)
Migrations for latest Relational DB patch.
User check task.
[bare] core admin for relational objects.
Move user special feeds & subscriptions to a dedicated module for comprehension / same-level consistency.
Create a task to refresh PG feeds, which calls the mongo feeds refresher too.
Split the admin to make the Mongo → PG transition easier.
Fields rename and admin+JSON nightmare solving.
fields renames.