I changed both the CMake and ./configure build systems to use @ for
substitution in csc.scm.in. This was necessary for CMake's sanity, as
its CONFIGURE_FILE can only substitute @VARIABLES@ or ${VARIABLES}.
Trying to work around the %VARIABLES% in csc.scm.in was causing me
nightmares with CMake scripts and passing arguments through shells.
CONFIGURE_FILE is much cleaner. I changed the substitution variable
names while I was at it, which is immaterial to ./configure. Now
they're all INSTALL_*. I used \@ in the sed calls to prevent autogen.sh
from clobbering the @. I ran an autogen, ./configure, and "make
csc.scm". I got sane results, so I've pushed my changes to Darcs. If
anything breaks, blame me and I'll do something about it, but it
shouldn't as I've tested it.