Bug 9988: Merge should have a parameter hash

Bug 9988: Merge should have a parameter hash

We will need a few additional parameters for merge later on. This patch
puts the original parameters in a parameter hash.
For the same reason DelAuthority gets a parameter hash here.

Note: We remove the second parameter from the DelAuthority call in
authorities/authorities-home.pl here. It was not used and could have
presented problems in the future.

Test plan:
[1] Run t/db_dependent/AuthoritiesMarc.t.
[2] Run t/db_dependent/Authorities/Merge.t.

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Marc Véron <veron@veron.ch>
Signed-off-by: Jacek Ablewicz <abl@biblos.pk.edu.pl>
Signed-off-by: Julian Maurice <julian.maurice@biblibre.com>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>