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Added BBN Pager support
Clean up instruction options table.
Removed some unneeded loads.
Removed unneeded FMB term.
Cleaned up interrupt handling to properly handle PIR events.
Moved dev_pi to be with rest of PI code.
Don't check APR interrupts unless pi system enabled.
CONO APR reset_all does not clear flags on KA10.
Clean up handling of PUBLIC/CONCEALED mode on KI10.
Clean up ITS pager support.
Added fetch flag to page_lookup for ITS/KI and BBN support.
Speed up LDB/DPB instructions to use bulk shift.
Carry 0&1 Flags are not cleared until JFCL instruction.
Fixed bug in LSHC with shift > 36 bits.
Fixed bug in JFCL when run from trap/uuo, bumped PC when it should not..
Shortened loop for BLKI/BLKO instructions.
Mask AR & MQ to FMASK before save in one place.