Bug 11084 - Delete biblios on Leader 05 == d

 Bug 11084 - Delete biblios on Leader 05 == d

Position 05 of the leader in MARC 21 indicates the record's status.
A lower case 'd' indicates that the record is to be deleted
(http://www.loc.gov/marc/authority/adleader.html).

This patch adds a cronjob script that may be run nightly to delete
records where position 05 of the leader is set to 'd'.

Test Plan:
1) Edit one or more records, and set the leader position 05 to 'd'.
2) Run misc/cronjobs/delete_records_via_leader.pl -c -v
3) Those records should either be deleted, or an error message should
   state why they were not.

Signed-off-by: Magnus Enger <magnus@enger.priv.no>
Works as advertised. Edited a record with an item to have leader05 = d,
then ran delete_records_via_leader.pl with -c and got a message that
the record could not be deleted because of the item. Removed the item
and the script deleted the record. Tried with another record with an
item, this time with the -i option and the record was deleted.

Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Brendan A Gallagher <brendan@bywatersolutions.com>