Email tag comments regardless of user preference

(According to issue 3573, turning off comments for works should not prevent tag wrangling comments from being emailed.)

Includes new and edited comments.
3538 with Top button causing works to reload
Add filtered class to unassigned fandoms page, generally tidy it up, start moving sorting to filters
3379 with user-inputted text escaping container
3379 add it to all userstuff, even non-paragraphs, because the parser can be funny
Rebase and tweak the whitespace on pre a bit to make wrapping nicer
Taking that back out, since I am recalling a reason I didn't use it and it doesn't really make much difference
Fix Works link for user dashboards and add tests for Works, Series, and Bookmarks links
Add Bookmarks and Works links to collection dashboard modules and add tests for them
3786 Don't use testy for the new test
3786 I call this development driven tests, ie tests edited until they pass
set work.posted field earlier on update, before date calculation is done
Merge pull request #1452 from tuff-ghost/issue_3852

3852: Backdating doesn't work when posting after Preview
Merge pull request #1145 from sarken/issue_3538

3538 with Top button causing works to reload
Merge pull request #961 from sarken/issue_3379

3379 with user-inputted text escaping container
Merge branch 'refs/heads/master' into 0.9.12-issue-3573-tag-cmts-mandatory
Merge pull request #1361 from sarken/issue_3786

3786 "Works" button at bottom of user and collection Recent Works lists has vanished
Can haz test!
Merge pull request #1216 from CristinaRO/issue-3573-tag-cmts-mandatory

Email tag comments regardless of user preference