LP#1131889: sort TPac copy list by normalized call number

... as opposed to the literal call number label.  E.g., this
patch would make LC call number "AE5 .E363 1975 v.10" sort
after "AE5 .E363 1975 v.9" rather than after "AE5 .E363 1975 v.1"

Signed-off-by: Galen Charlton <gmc@esilibrary.com>
Signed-off-by: Ben Shum <bshum@biblio.org>