Fills in _manage_producers stub for DProcMS
Adds association: DataProcess -> Process

Conflicts:
	extern/ion-definitions
Fixed the producers issue with the new DataProcess framework

When the process is registered via DAMS, it not only looks at the data
process definition but more importantly at the data products to get the
parameters.
Merge pull request #601 from lukecampbell/data_process_mgmt

Fills in stub method for data process work