PDP10,PDP11,VAX: Addition of inter operable DUP11, DMC11 and KDP11 devices

This is the results of external KDP development activities.  The KDP side done by Timothe Litt and DMC and DUP by Mark Pizzolato

Additionally, other PDP10 updates from Timothe Litt
Merge remote-tracking branch 'simh/master'
Merge remote-tracking branch 'origin/master' into KDP