Revamped the options for making changes in the catalogue. Syrup

Revamped the options for making changes in the catalogue. Syrup
will always defer to the catalogue for call number and status information
but will keep a copy of the call number, location, and circ modifier
when an item is added to the course. This means the information can
be reverted at the end of a term.

Signed-off-by: Art Rhyno <art632000@yahoo.ca>