SCLENDS bibliographic dedupe routine

SCLENDS bibliographic dedupe routine

This implements a bibliographic deduplication routine based
on criteria and an algorithm specified by the South Carolina
State Library on behalf of the SC LENDS consortium.  This work
was sponsored by SC LENDS, whose impetus is gratefully
acknowledged.  Portions of this script were subseqently expanded
based on the advice of the Indiana State Library on the behalf
of the Evergreen Indiana project.

This is meant to run in an Evergreen database.  Usage would
be something like:

psql -U evergreen < sclends_dedupe.sql

However, in practice it is highly recommend to edit the script
first; any bibliographic deduplication requires close attention
to the particular data found in the Evergreen database.

Signed-off-by: Galen Charlton <gmc@esilibrary.com>