* lisp/textmodes/flyspell.el: Commenting style, plus code simplifications.

* lisp/textmodes/flyspell.el: Commenting style, plus code simplifications.
(flyspell-default-deplacement-commands): Don't spell check after
repeated window/frame switches (e.g. triggered by mouse-movement).
(flyspell-delay-commands, flyspell-deplacement-commands): Use mapc.
(flyspell-debug-signal-word-checked): Simplify and fit in 80 cols.
(flyspell-casechars-cache, flyspell-ispell-casechars-cache)
(flyspell-not-casechars-cache, flyspell-ispell-not-casechars-cache):
Remove unused vars.
(flyspell-get-casechars, flyspell-get-not-casechars):
Simplify; Don't bother removing a ] just to add it back.
* lisp/textmodes/ispell.el (ispell-program-name): Use executable-find.