(flyspell-notify-misspell): Fix misspelling of "Misspelling".
(flyspell-process-localwords): New function.
(flyspell-large-region): Call flyspell-process-localwords and
flyspell-delete-region-overlays.
(flyspell-delete-region-overlays): New function.
(flyspell-delete-all-overlays): Call that.