#756 Enforce the "Cover:" prefix for COVERART titles

[Ahasuerus]

Enforce the "Cover:" prefix for COVERART titles. The prefix can be dropped when editing title records and creating variant titles. The following safeguards could be implemented:

1. A JavaScript pop-up when editing Titles and creating VTs.
2. Add moderator warnings
3. Create a cleanup report.

[Ahasuerus]

Cleanup report created in:

edit/cleanup_report.py 1.16
edit/isfdblib.py 1.132
nightly/nightly_update.py 1.140

Installed in r2015-240 on 2015-11-19. Keeping the FR open since we still need to add JavaScript validation.

[Ahasuerus]

Part 2 - Enforce the Cover: prefix:

common/pubClass.py 1.30
css/edit_pub.js 1.11

Installed in r2015-241 on 2015-11-19. Closing.