LP#1078593 Regenerate summaries when deleting issuances

LP#1078593 Regenerate summaries when deleting issuances

Both interfaces currently allow you to delete issuances even if they
have items attached and have the delete cascade.  While this might be
a dangerous allowance, we should still make sure to keep our summaries
updated when this happens.

This commit adds automatic summary regeneration when deleting issuances
in either serials interface.

Signed-off-by: Dan Wells <dbw2@calvin.edu>
Signed-off-by: Kathy Lussier <klussier@masslnc.org>
Signed-off-by: Ben Shum <bshum@biblio.org>