[Koha] Deduplicate authorities

[Stefano Bargioni]

> There is not any authority deduplicator at present included in Koha. I
> proposed bug 7419 because it would be very useful to have one, but that
> project has not been funded yet. It is possible that someone else has
> already written one, in which case I would encourage that person to
> contribute said script to the community, 'cause lots of us would love to
> have it.

IMHO, authority deduplication is similar to authority unlink/link. Consider two terms like
"Bargioni, Stefano, 1959-" linked to N1 biblios
and
"Bargioni, Stefano" linked to N2 biblios.
You need to unlink N2 biblios from the second term, i.e. link them to the first one.
Deduplication can be automatic, while the step of choosing term-from and term-to for unlink/link biblios must be manual.
I added this comment to bug 7419 http://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=7419.
Stefano