🚀 go-pugleaf

I've already replied privately to Mitch about this, but as his message appears
on gnu.chess I thought I'd post a reply here too.

"xboard gnuchessx" is incorrect syntax.  Correct syntax is just "xboard"
(gnuchessx is the default chess program) or "xboard -fcp gnuchessx".  The
incorrect syntax appears in an example in the gnuchess (not xboard) README
file; hopefully that will be corrected in the next gnuchess patchlevel.

The problem with the -matchMode option was due to an incompatibility in the
tolower() function used in a few places in xboard.  Old versions of this
function give a garbage result unless the argument is an uppercase letter, so
the code "isupper(c) ? tolower(c) : c" must be used instead of "tolower(c)".
I'll change xboard to use this idiom in patchlevel 20.

The bug in printing error messages will also be fixed in patchlevel 20.

Thanks, Mitch!

	--Tim