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.
Merge branch 'refs/heads/master' into 0.9.12-issue-3573-tag-cmts-mandatory
Can haz test!
Merge pull request #1216 from CristinaRO/issue-3573-tag-cmts-mandatory

Email tag comments regardless of user preference