Implement a "flatten" or "archive" command

[kevin]

Revisions are great, but there's generally little value in keeping revisions from last year hanging around. It would be nice to have some manner of 'reset'.

Some questions:

• Should these be tracked in database?

• Should it at all try to automate a schema dump (eg. mark which schemas are dumped in config file)?

• Should it just flatten all revisions into a single script?