Emulate graph indexes in XA 1.1
XA 1 had the following indexes:
GSPO GPOS GOSP SPOG POSG OSPG
XA 1.1 is able to remove the last 3 indexes for most queries, but there are still some queries that require them. In these cases the effect of these indexes can be emulated by using the contents of the system graph. This requires the system resolver to correctly bootstrap itself, as it will need to interrogate itself for information that must be present before the emulation can occur.