PDP10: Added DMA transfer debugging (IN, OUT and NXM) to the unibus adapter.
PDP10: Fix formatting of UBA DMA debug output
PDP10: Extended UBA DMA debug output to also be available when doing DMA in 16bit or 18bit modes and added display of words and bytes to the debug output.
Compiler suggested cleanup
PDP10: Correctly format the various data displayed in the debug output
PDP10: Fix UBA DMA debug output to use inverted byte and word masks
PDP10: Added missing UBA DMA debug output of the trailing bytes when a partial word is referenced at the end of a DMA transfer.

Added ascii and sixbit decoded contents displayed in the debug output.
PDP10: Add missing updates from prior commit
PDP11, VAX, PDP10: Fixed setting of register value reflecting return buffer address - Problem reported by R. Voorhorst
I1401: Fix to deal with instructions that are longer than 8 characters (from Van Snyder)
PDP10: Added a generic UBA debug routine to log NXM events.  Converted all internal NXM debug output to use this new routine.
PDP10: Initial code for 36bit DMA operations
SCP: Added the NEXT command.  This command provides the ability for a simulator to step over subroutine calls.
VAX: Added support for the NEXT command to step over subroutine calls BSBB, BSBW, JSB, CALLS and CALLG
PDP10: Fixed UBA reset logic to only reset the devices which are connected to the UBA being reset (reported by R. Voorhorst)
SDS: Support simulator's new NEXT command to step over subroutine calls

Step over BRM, POP or SYSPOP by planting temporary (dynamic) breakpoints at P+1 and P+2.