Comment 1 for bug 1496522

Here is what I came up with so far.

http://git.evergreen-ils.org/?p=working/Evergreen.git;a=shortlog;h=refs/heads/user/blake/LP1496522_action_trigger_for_periodic_billing_statement

This method will target all of the patrons who have ever had a bill in a given org unit (owner of the AT compared to the billing_ou in the view). Then the validator step will weed them out according to the OU library setting. I recommend using a granularity although the stock insert does not setup a granularity. I couldn't decide which granularity to use by default. I suppose "Monthly"