RSMultipliers bugfixes

- Fixed LocalRSMultipliers page in MCM menu (was not looking into the
correct array).
- Fixed SetRelationshipMulti() and SetRelationshipMultis() to not put
duplicate entries into their arrays.
- Fixed RemoveRelationshipMulti() and RemoveRelationshipMultis() to look
into the correct arrays.
- Updated test script fragments to use the new names of renamed
functions().