Issue 3182: Defuse the obfuscated Scheme programming contest

Issue 3182: Defuse the obfuscated Scheme programming contest

This merely grepped for occurences of "reduce" and replaced most of
them (and possibly the close surroundings) with something saner.  The
winner definitely has been in bar-line.scm.  I have not touched the
occurences in stencil.scm since it would have been like putting
lipstick on a pig: the surroundings are even worse than the calls of
reduce.