Comment 1 for bug 1793802

I have some interest in data cleanup prior to upgrading to 3.1, so I put together a patch to implement the above for feedback, minus the purge-interval setting. May revisit that later via another LP.

http://git.evergreen-ils.org/?p=working/Evergreen.git;a=shortlog;h=refs/heads/user/berick/lp1793802-aged-billing-payment

Similar to aged_circulation, the new tables are created with indexes and NULL constraints, but no foreign key refs.

Includes pgtap tests and release notes.