LP#1650409: improve authority_control_fields.pl's --all and --days_back processing

LP#1650409: improve authority_control_fields.pl's --all and --days_back processing

When --all is used, the list of bibliographic records to process is now
retrieved via a direct database query instead of using open-ils.storage,
avoiding a potential timeout.

The query used to fetch records when --days_back is used now fetches
all records that were edited up to the specified number of days
ago. Prior to this patch, --days_back ended up fetching records
created on the current day and records edited on the --days_back
day, skipping any that were updated in between.

Signed-off-by: Rogan Hamby <rogan.hamby@gmail.com>
Signed-off-by: Jane Sandberg <sandbej@linnbenton.edu>
Signed-off-by: Galen Charlton <gmc@equinoxinitiative.org>