Add clean_marc function to OpenILS::Utils::Normalize.

Add clean_marc function to OpenILS::Utils::Normalize.

Add a library function to clean up MARC records for how we like to
store them in the biblio.record_entry table. Having this in a library
will reduce code duplication.

Also, replace nearly identical code in OpenILS::Application::Vandelay
and OpenILS::Application::Acq::Order with calls to this new function.

Signed-off-by: Jason Stephenson <jstephenson@mvlc.org>
Signed-off-by: Dan Scott <dscott@laurentian.ca>