Merge function for workspaces

Users should be able to merge workspaces in Aha so that they do not need to delete other records first. Currently, if one attempts to create a new workspace with an abbreviation (ABC) and ABC already exists for some records (like features or ideas), they are unable to create the new workspace. They are forced to first delete the features or ideas with abbreviation ABC before creating the workspace.

They should have the ability to merge workspaces together (perhaps by choosing which fields and records to merge).