VTS interactions with MacLISP

[JONL at MIT-MC (Jon L White)]

1) the TM%SCR bit of a subsystem is not inherited from the
   setting at exec (say, @TERM WRAP), consequently MacLISP
   is just forcibly setting it to some state now  -- 
   the (STATUS TTY) function will have an option for reading
   the Terminal Mode Word, and (SSTATUS TTY ...) will set it,
   so MacLISP users can tailor these bits to their own needs.
2) ITS standard for outputting a control-P while in display
   mode is to output control-P followed by P, which will print
   out as "^P"; but VTS apparently just prints nothing here.