IMPORTANT - fixed HubSub to properly fetch primary keys

IMPORTANT - fixed HubSub to properly fetch primary keys

In commit e95f77d34c501d345e731ccf6bc722034d155b77 HubSub lost the
'staticGet' function in a consolidation into the Managed_DataObject class.
This was done carelessly by me as HubSub::staticGet was actually taking
two arguments, none of which was a key and merging them in HubSub::hashkey()
(staticGet was renamed getKV 2a4dc77a633cc78907934fd93200ac16d55be78e).

NOTE: This complements commit 7e4718a4eb8d0e932398d6f150339fa6aec05267 which
fixed a similar issue for the Magicsig class.