Added a test to ensure that when migrating out an event with global ids shared with other events, only that one event is migrated. Previously, the global id was pulling in extra events.
Added a test to ensure that when migrating out an event with global ids shared with other events, only that one event is migrated. Previously, the global id was pulling in extra events.

realmacsoftware/ensembles,ChronicStim/ensembles,drewmccormack/ensembles,ChronicStim/ensembles,realmacsoftware/ensembles,drewmccormack/ensembles