1. Add space between threads
2. Change Show/Hide to Expand/Collapse and visually separate it
3. Limit a thread to 700px high and scroll if longer

Co-authored-by: marco <marcotuts@gmail.com>

JIRA: FOR-373

This reverts commit e4819a1b, reversing
changes made to b6ec41ca.

Now that we're ready to test again, need to revert the revert to put the filtering UI back in.

This reverts commit 66889b87, reversing
changes made to 0dd9c24e.

This was merged too early--it's still missing the filtering and display-your-cohort changes.
Will need to revert this revert later.

use subviews for rendering. Functionality should be the same. Changed a few things
in DiscussionThreadView to make this a little easier.

Convert expand/collapse into buttons and change default sort order to date. Buttons should be styled better but I don't know how to do it.

Fix accidental code formatting of abbreviated posts and put administrative buttons in the expanded content.

following if it wasn't working before.

Expanding and collapsing threads on inline forums works, but it could use a little styling. Also fixed responding to threads which I may have broken in the commit prior to this one.

Make appended_id for WMD editor a little less hacky by getting it from data-id of the 'reply-body' element instead of from _id of the wrapper.

Fix WMD editor reply boxes on embedded discussions, although I think the way it's implemented is something of a hack.