LP#1712657 Merge patron checkout history

LP#1712657 Merge patron checkout history

Transfer checkout history rows to the destination user during patron
merge.

To Test:

1. Enable circ history tracking for 2 users, ideally 2 with same
   last name for easy searching.
2. Check out items to both patrons.
3. Load the 2 patrons in the patron search UI and merge one into the other.
4. action.usr_circ_history rows previously linked to the deleted patron
   will now be linked to the active/lead patron.

Signed-off-by: Bill Erickson <berickxx@gmail.com>
Signed-off-by: Jason Etheridge <jason@EquinoxInitiative.org>