LP#1414197 Serial Item Delete Improvements

LP#1414197 Serial Item Delete Improvements

If a serial item is received, then deleted without any further status,
it can leave the system in an inconsistent state:

1) If from a multi-item unit, the unit contents are not updated.
2) If from a single-item unit, the unit is not deleted.
3) If the last holding of its kind, holdings summaries are not updated.

Since 'resetting' items has all the necessary logic to handle the above
needs, this commit runs each deleted item through the reset code before
doing the actual delete.  This also gives the benefit of keeping the
logic centralized for future fixes/enhancements.

Signed-off-by: Dan Wells <dbw2@calvin.edu>