I started unifying all the various ``Plan 9 on Unix & Nt'' thingies
a while ago, but I got bogged down trying to make a better
Inferno, which nobody (here at least) really wanted.

I've shelved the Inferno effort.  Russ has been helping with
drawterm, on and off.  I might spend some time over the
weekend tidying up the remainder of "9pm".  There shouldn't
be all these different versions of sam and the supporting libraries.