[Slackers] xlang tools

[Steve Judd]

I haven't updated xlang yet, but I did collect some tools together that
have been mentioned here:

http://www.ffd2.com/fridge/slang/xlangmisc.zip

Specifically, this has petcom.c, for converting files from petscii->ascii,
and slangformat.c, for formatting the ascii files.  The script "slangvert"
rolls them together to convert petscii files to ascii.

For what it's worth...

-S