Added a days_back parameter to authority_control_fields.pl in order to process bibs edited X amount of days ago.
The days_back parameter can be used to easily run the script through cron nightly and have it process all newly created or newly added bib records. Ideally it would be ran once a day at nighttime prior to midnight using the --days_back 0 option.
Signed-off-by: Steven Callender <stevecallender@esilibrary.com> Signed-off-by: Lebbeous Fogle-Weekley <lebbeous@esilibrary.com>