Add more xddmcp tests.

Make sure that in fixing the large thread count, I don't add any more regressions.
Updates to prevent hangs at 100%.

It seems to happen at thread counts larger than the FD_SETSIZE.  So
don't allow that.
Updating buildbot to latest.
Fix port fiddling with new thread counts

No longer fiddle with the ports in the XDD package, just handle it
all in the frontend.
Update version and add close()
Add working version of xddprof

XDDProf got lost ian the move.  This is a working version of
xddprof.  Some of the options still aren't implemented.