- Added a number of `ANALYTICS_API_DEFAULT_*` and `ANALYTICS_API_REPORTS_*` variables to allow more selective specification of database parameters (rather than
overriding the whole structure).
- Role: edxapp
- Remove EDXAPP_ANALYTICS_API_KEY, EDXAPP_ANALYTICS_SERVER_URL, EDXAPP_ANALYTICS_DATA_TOKEN, EDXAPP_ANALYTICS_DATA_URL since they are old and