parallel fine generator

parallel fine generator

The fine generator cronjob can now use multiple
parallel processes by setting fine_generator/parallel
in opensrf.xml to a value greater than 1.  This
can speed up periodic fine generation in a database
containing a large number of overdue loans.

Also added a service to return just the list of
IDs of overdue loans and reservations - fleshing
the entire set of overdue loans when generating fines
has been observed to cause significant swap-thrashing in
at least one large database.

Signed-off-by: Galen Charlton <gmc@esilibrary.com>
git-svn-id: svn://svn.open-ils.org/ILS/trunk@18817 dcc99617-32d9-48b4-a31d-7c20da2025e4