EDMCreator+EDMDeserialiser: handle missing aux container
Imrpove the "GapFiller" to also handle the case where we are only missing the Aux store (as opposed to interface and Aux store). This happens in two stages:
- On deserialization when we discover a missing Aux store, we add a
DataLink
with the correct name to StoreGate. - The EDMCreator (aka "GapFiller") takes care of creating an empty Aux store of the correct type under that name.