This will make a number of things easier in the future, as well as (finally!)
avoiding the Id-smashing problem which has plagued developers for so long.
Boy, I'm glad we're not using sup anymore. This update would have been
insane otherwise.
and `rtsflow' are the components of `crtscts'. `dtrflow' and `dsrflow' are
new and not yet supported. `dtrflow' may be useful for Cyclades serial
careds, which have h/w support for it and no h/w support for `rtsflow'.
print.c:
Report NTTYDISC in case the line is in this obsolescent state.
