- repair the autogen index test which apparently wasn't running for Postgresql
due to a hardcoded sqlite_db()
- get autogen index test cleaned up, working on Postgresql and MySQL
- rework the autogen index/unique constraint logic to consider both sets of
objects together, and work up all new rules for deduping, comparison.
Add new rules specific to MySQL and SQLite and expand the flexibility surrounding
the "dupe unique index/unique constraint" thing to work around MySQL doing it
in both directions, handles #157
- add a lot more tests and try to emphasize no false positives