Add new facility mode for reporting rate report

![screenshot 2014-12-04 12 33 01](https://cloud.githubusercontent.com/assets/152134/5303289/1f1d18ca-7bb6-11e4-872d-c100bd3871c4.png)

https://docs.google.com/a/dimagi.com/document/d/1WkTqsdy4aC-gF1j0mGUCs7p_Y41jK5LGq0kxDJWF_hQ/edit
just realized this does one couch hit per transaction, and potentially includes lots of transactions per supply point. why do we check against stock transactions again (as opposed to just looking for a submitted form in that window which we could do with sofabed or couch). 

this query might want to use sofabed either way to avoid the couch lookup (realize this was just moved but just noticing now)