move report maps, etc. out of settings.py

Mutually dependent on https://github.com/dimagi/core-hq/pull/503

and 

https://github.com/dimagi/bihar-reports/pull/46
https://github.com/dimagi/mvp-reports/pull/28
https://github.com/dimagi/pathfinder-reports/pull/2
https://github.com/dimagi/pathindia-reports/pull/1
https://github.com/dimagi/psi-reports/pull/3
https://github.com/dimagi/dca-reports/pull/2
https://github.com/dimagi/a5288-reports/pull/1
https://github.com/dimagi/hsph-reports/pull/9
https://github.com/dimagi/payments/pull/7