Bug 7677 [Follow-up]: New areas in subscriptions and new functions when receiving.

Bug 7677 [Follow-up]: New areas in subscriptions and new functions when receiving.

 - Various fixes.

Test plan:

Once the makePreviousSerialAvailable syspref is enabled, receive a serial, and then another, then check that:

 - the first received itemtype has been set to the "previous item type" value (set in the subscription).

 - the first received has been made available.

 - the last received serial itemtype has been set to the "item type" value (set in the subscription).

 - 995$l is automatically prefilled.

Configure the serialsFieldsToAV syspref. When creating or editing a subscription, check that:

 - the domain and/or origin and/or support fields are correctly displaying the authorized values configured in the syspref.

Signed-off-by: Chris <chris@bigballofwax.co.nz>
Signed-off-by: Katrin Fischer  <katrin.fischer@bsz-bw.de>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>