(flyspell-issue-message-flag): New user option.

(flyspell-issue-message-flag): New user option.
(flyspell-mode-on, flyspell-notify-misspell)
(flyspell-small-region, flyspell-external-point-words)
(flyspell-large-region): Use it
(flyspell-before-incorrect-word-string)
(flyspell-after-incorrect-word-string): New user options.
(make-flyspell-overlay): Use them.
(flyspell-version): New function.
(flyspell-incorrect-face, flyspell-duplicate-face): Adapt face definitions
to use :weight.
(flyspell-insert-function): New user option.
(flyspell-auto-correct-word, flyspell-correct-word)
(flyspell-xemacs-correct): Use it.
(flyspell-define-abbrev): New function.
(flyspell-auto-correct-word, flyspell-correct-word)
(flyspell-xemacs-correct): Use it.
(make-flyspell-overlay): Use `evaporate' property.
(flyspell-auto-correct-word, flyspell-correct-word): Remove overlay.
(flyspell-emacs-popup): Use `session' instead of `accept'.
(flyspell-auto-correct-previous-pos): New variable.
(flyspell-auto-correct-previous-hook)
(flyspell-auto-correct-previous-word): New functions.