Status field on Discussion Groups for 'archiving' or 'closing' discussions

Status field on Discussion Groups for 'archiving' or 'closing' discussions since currently they exist or they can be deleted. Nothing else.

For Social users we create Discussion Groups per external client, and those clients access the Discussion Group. But we do not want to delete them once the project is finished since we want the information discussed and who was involved. We can only 'delete'. Suggest an archive or other status, e.g. Completed, like the project status option for Completed. 

CR-257562