Changes the behavior for the patron-login component (after staff login) to match
the OPAC. By default, it assumes you are logging in with a usrname, but if the
org unit setting 'opac.barcode_regex' is enabled and the incoming value matches,
then it gets treated as a library card barcode instead. If usrname is used, then
the card referenced by actor.usr.card is checked in lieu of a specified barcode.
Signed-off-by: Jason Etheridge <jason@esilibrary.com> Signed-off-by: Mike Rylander <mrylander@gmail.com>