Added 88-HDSK support from Mike Douglas to AltairZ80
Updated year in copyright and implemented sim_vm_pc_value
Updated AltairZ80 documentation and incorporated altairz80_mhdsk.c in build process
TMXR: Enable proper inheritance of mux global/default buffering value to individual lines.
TMXR: Change modem DSR & DCD to never be indicated as on unless a connection is present.
AltairZ80: Added boot to MHDSK device and improved disassembler
Merge remote-tracking branch 'upstream/master'
PDP11, PDP10, VAX: Fix DMC and DUP DDCMP debugging output for packet data
TMXR: Change DSR to reflect attached state of line and DCD to reflect connected state of the line.
SCP: Fix SHOW DEBUG device debug flags output for devices which may have debug settings which set multiple flags.
PDP10, PDP11, VAX: Fix DMC & DUP unit attach strings for multi-line device configurations.
Merge branch 'master' of https://github.com/psco/simh
TMXR: Properly enable packet mode (as inherited from the main mux) on each line.  Only produce modem debug output when modem signals have changed.  Cleanup the output of SHOW MUX.
PDP10, PDP11: Fix DUP device to properly activate polling on simulator startup (after reset) if any DUP devices are attached.
Merge branch 'master' into BlinkenLights