Reworked the initialize_production_deployment.py script to better sup…

…port syncing of records

Changes include:
	* Addition of a --service argument to specify the source provider (DataCite or OSTI) to pull existing records from
	* Addition of a --prefix argument to specify a DOI prefix to query for, other than the default in the INI config
        * Fixes to ensure that queried DOI's are imported using the format expected by the service configured in the INI config
        * Misc code/documentation cleanup