* __scm.h, chars.c, debug.c, eval.c, eval.h, extchrs.c, extchrs.h,

* __scm.h, chars.c, debug.c, eval.c, eval.h, extchrs.c, extchrs.h,
fdsocket.c, feature.c, mbstrings.c, mbstrings.h, numbers.c,
numbers.h, print.c, scmhob.h, simpos.h, symbols.c, symbols.h,
tags.h, throw.c, variable.h: Name cleanup.  Lots of xxxSCM_yyy
removed.  (These were introduced by unsupervised name
substitution.)