* Rewrite core group operations, image operations, window operations,

* Rewrite core group operations, image operations, window operations,
and the regular-expression compiler to use fixnum arithmetic.  This
has a pronounced performance effect.

* Change "decls" to pass integrable-procedure definitions between a
few crucial files.

* New variable `enable-emacs-key-names' controls whether keys are
displayed using Emacs-style names or Scheme-style names.  The default
is Emacs-style.

* C-h C-b now runs `describe-bindings' as in Emacs.