
Backport of p9p's stats to plan9.

Backend servers for plan9, windows and linux and OSX,
Free/Net/Open BSD should be trivial but I don't have any
(see rsc's p9p code).

Note: the windows, linux and osx executables are held in the 
users bin dir rather than $objtype/bin which I tend to use.
This is necessary as the plan9 client has no knowledge
of the cputype of the remote host when it specifies the
path to the executable.

It is generally necessary to use absolute (or at least homedir relative)
paths as these OS's dont run the users login script when starting shells
from ssh.

I have modified my rx(1) to try dos(1) my command line interface to
a windows PC. Openssh on windows is good enough for nstats(1).

For extra merit, modify nstats.c so it auto-generates the list
parameter names from those seen from remote clients.

-Steve			June 2014
