Draft: Convert banks to py2
Draft
It's VERY not neat. Lots of indentation, just removed a bunch of debug, and there's some TODOs and FIXMEs to address.
It currently doesn't save as a gzip.
Changes
I've used this a couple of times to convert py3 banks to py2, and I think we'll need it for some time.
The banks finished generating successfully after some unrelated fixes to our bank gen code, so I Think it's good to go on that front.