(decipher-make-checkpoint, decipher-resync): Removed special
support for font-lock.
(decipher-resync): Removed `$' from regexps.
(decipher-set-map): Use font-lock-fontify-region-function.
(decipher-font-lock-keywords): Removed newlines from regexps.
(decipher-use-font-lock): Deleted.
(decipher-toggle-font-lock, decipher-turn-on-font-lock): Deleted.
decipher-make-checkpoint, decipher-resync): Added special support
for font-lock.
(decipher-use-font-lock, decipher-font-lock-keywords): New vars.
(decipher-toggle-font-lock, decipher-turn-on-font-lock): New funcs.
(decipher-char): Added defvar (and also for following variables).
(decipher--prev-char): Renamed from decipher-prev-char.
(decipher--digram): Renamed from digram.
(decipher--digram-list): Renamed from digram-list.
(decipher--before): Renamed from before-array.
(decipher--after): Renamed from after-array.
(decipher--freqs): Renamed from freq-array.
