Destroy surplus columns
Ref T1191. This destroys surplus columns:
- Pholio's transaction comments have a mockID column, but this is not used. The imageID column is used instead.
- Phragment has an unused description column.
- Releeph has an unused summary column.
- Grepped for usage of these columns.
- Checked that these exist in production, too.
- Ran upgrades.
- Added Pholio inline comments.
- Saw fewer warnings.
Reviewed By: btrahan
Subscribers: epriestley, hach-que
Maniphest Tasks: T1191
Differential Revision: https://secure.phabricator.com/D10591