Add storage for new Differential transactions and transaction comments
Summary:
Ref T2222. Ref T1460. Depends on D6260.
This creates the new tables, but doesn't start using them. I added three new fields for T1460: Add "Done" link to an inline comment, to represent fixed/done/replied states.
Test Plan: Ran storage upgrade.
Reviewers: btrahan
Reviewed By: btrahan
CC: chad, aran
Differential Revision: https://secure.phabricator.com/D6261