User configurable reports

the plan is to pilot/QA on this on prod so I'm putting it out for code review now. I'm guessing it's easiest to review as a whole, though the commits should represent ~atomic actions.

I think it's good to merge whenever code review passes.
http://legacy.datatables.net/usage/server-side

i have no idea about data_keys though. not even sure that's necessary. will look.