Fix TMXR line transmit buffer allocation to always be allocated if a listening socket is open
Cleanup remote console single command mode.
Instrumented the qvss activities for better debug support
change QVSS device to autoconfigure its vector so other autoconfigured devices get correct vector assignments when the QVSS device is enabled
Revert clearing of sim_interval on sig-int to properly manage the passage of time.
Allow IPL30 devices to interrupt.

The specification (and intent) was for IPL30 devices to interrupt on BR4.  However, the mask inadvertently ended with IPL20.

Confirmed with Bob.
Merge branch 'master' of https://github.com/simh/simh
PDP-10 updates

UBA: NPR support for accessing IO space.
UBA: NPR eliminate unnecessary mapping checks for each transfer; check only when crossing page boundaries.

FE: Implement Keep-alive and host-requested reload functions of 8080.  Update comm area doc.
CPU: FE execute, restart and halt

RP,TU: Preserve hardware configuration flags in RLWORD.
RP: Tell FE which RH, Unit were used for boot.
Merge branch 'master' of https://github.com/tlhackque/simh into KDP