Sam Moore's sandbox: Registration Reschedule

This module extends Entity Registration (https://drupal.org/project/registration) to allow an admin to move a registered user to a different event.

Currently the module is highly specific to my client's use case; registrations are attached to Commerce products, for example, so I need to modify the Commerce Order details as well as simply attaching the registration to a new entity.

I'm intending to modify it to be more generally useful, especially for folks who don't use Commerce with Registration.
Also my client has request VBO integration so that multiple registrants can be moved in one operation.

Alpha code has been posted. Please contact me if you want to use this code as some sort of starting point.

Meanwhile any suggestions are cheerfully invited.