Comment 19 for bug 1975879

Here's a new branch:

https://git.evergreen-ils.org/?p=working/Evergreen.git;a=shortlog;h=refs/heads/user/berick/lp1975879-volcopy-edit-callnum-owner-v2

The top commit implements the logic requested by the Cataloging team. When changing the owing library of a call number from within the Holdings tab, propagate the value to the circ lib of all attached copies, period.