[I7] XO Port (sorta) uploaded

[Adam Thornton]

There's now a (curses-based, installs in /usr/local by default, in-no- 
way-Sugarized) I7_5T18_Linux_xo.tar.gz in the usual directory.

It's just the command-line 5T18 port with the following changes:
The user shell is written in Python, not Perl.
It invokes nfrotz as the z5/8 interpreter.
It invokes glulxe built against glkterm 0.8.0.

It appears to run adequately on the XO, although it cannot compile my  
(nearly 110,000-word) WIP.  Less ambitious projects are fine.

Adam