move authority_control_fields.pl functionality to the database

For reference, see Dan Scott's comment on bug 1081641: https://bugs.launchpad.net/evergreen/+bug/1081641/comments/6.

authority_control_fields.pl is the current way to create linkages between bib records and authority records. Similarly authority_authority_linker.pl is currently the way to link authority records to each other for the purposes of browsing and searching. Unfortunately this method takes an unduly long time on large bibliographic databases (which the authority_control_fields.pl script warns you about when selecting the "--all" option).

As Dan indicates in his comment, the Perl script approach was a proof of concept which has become the only existing way to do this and the eventual goal was to have this functionality live in the database. I'm opening this wishlist bug to further progress on that goal.