Summary:
- Change column type from `sort128` to `sort`.
- Remove `originalName`. This column is unused. Long ago, we used it to generate a `Thread-Topic` header for mail, but just use PHIDs now (the value just needs to be stable for a given object, users normally don't see it).
Test Plan:
- Created a package with a beautifully long name. Magnificent!
- Grepped for `originalName` / `getOriginalName()`, found no Owners hits.
- Verified that there isn't any name-length validation code to remove.
{F4925637}
Reviewers: chad, amckinley
Reviewed By: chad
Differential Revision: https://secure.phabricator.com/D17798
