Form and data management

This allows staff members to staple additional forms to tickets and change the sorting preference on existing forms, along with a few other minor feature enhancements:

### Enhancements

  * Add and remove forms from tickets
  * Prompt to remove instance data for a field when removed from a form
  * Allow inline sorting of forms in the ticket-edit page
  * Delete forms in the ticket-edit page
  * Add, remove, and sort forms from the ticket-view page

### Comments welcome for

  * (How to) add forms from the ticket-edit page (without refresh or loss of other edits)
  * (How to) add forms to a client / user
  * Add inline sort and delete to the client information popup from ticket-view