Use dummy call number in NCIP::ILS::Evergreen->acceptitem.

Use dummy call number in NCIP::ILS::Evergreen->acceptitem.

We have received an AcceptItem message with a missing call number
for the incoming copy.  This prevents Evergreen from accepting
the item because Evergreen needs a call number to link the new
copy to the new bibliographic record.  This commit will use
either the FromAgencyId and RequestId concatenated or the copy
barcode as the call number when no call number is provided.

This may not be an issue with the use precats option.  However,
there are still issues with precats in Evergreen, so use of that
option is strongly discouraged.

Signed-off-by: Jason Stephenson <jstephenson@mvlc.org>