* The "Newest" tab of the forum is updated with new filter options.
* Which forums: All, Official, Community, My List
* Show: By threads, All posts
* The option for "Which forums" is saved in the user's preferences and set as
their default on future visits, similar to the Site Gallery "Whose photos"
option.
* So users can subscribe to their favorite forums and always get their latest
posts easily while filtering out the rest.
* Forum Moderators
* Add the ability to add and remove moderators for your forum.
* Users are notified when they are added as a moderator.
* Moderators can opt themselves out by unfollowing the forum.
* ForumMembership: add unique constraint on user_id,forum_id.
Adds initial code for basically functional forums:
* Forums landing page shows hard-coded list of Categories along with any
forums in the DB that use those categories.
* Admin: Create, Edit forums and view forums you own or have admin rights
to modify.
* Landing page forums list shows the title/description and dynamic count of
number of Topics and total number of Posts in each forum. TODO: distinct
count of Users who posted in each forum.
* Board Index page shows list of Threads (posts) with a Replies count and
Views count on each thread.
* Thread view is basically an array of Comments. Users can post, edit and
delete (their own) comments. Deleting the first comment removes the
entire Thread - the thread points to a first Comment to provide its body.
* Reply and Quote-Reply options working.
