Generalized region skipping added.

Generalized region skipping added.
Checks comments only in code.
Added backward compatible support for customize.
(ispell-query-replace-choices, ispell-message-dictionary-alist)
(ispell-grep-command, ispell-grep-options, ispell-look-command)
(ispell-look-options, ispell-use-ptys-p, ispell-local-dictionary)
(ispell-dictionary-alist): Now customizable.
Fixed type of custom variables: ispell-help-in-bufferp.
(ispell-use-framepop-p): New variable.
(ispell-dictionary-alist): Added dictionaries: castellano, castellano8
czech, esperanto, esperanto-tex, norsk, russian.
Capitalize XEmacs correctly, and change lucid to xemacs in code:
(ispell-menu-lucid): Renamed to ispell-menu-xemacs.
Changed string compares for version number to be correct for XEmacs.
Fixed to work with string properties.
(ispell-recursive-edit-marker): new marker saving return point.
(ispell-skip-region-alist): New variable defining regions.
(ispell-tex-skip-alists): New variable for LaTeX regions.
(ispell-skip-sgml): Now buffer-mode aware.
(ispell-highlight-p): Support block cursors.
(ispell-message-text-end): Don't check signatures.
(ispell-comments-and-strings): New command, added to menu.
(ispell-int-char): New function for character incrementing.
(ispell-word): Produces message on error when called from
ispell-minor-mode.  Potential infinite loop removed.
(ispell-command-loop): prevent XEmacs modeline hiding.
Allow temporary split of dedicated windows.  Improve recursive
edit support.  Support block cursors.
(ispell-show-choices): New function cleaning up command loop.
(ispell-highlight-spelling-error-generic): Block cursor support added.
(ispell-highlight-spelling-error-xemacs): Block cursor, name change.
(ispell-overlay-window): dedicated window splitting, XEmacs changes.
(ispell-parse-output): Displays ispell process error messages.
(check-ispell-version): Interactive mode that shows ispell versions.
(ispell-begin-skip-region-regexp): New region skipping function.
(ispell-begin-tex-skip-regexp): New tex mode region skipping function.
(ispell-begin-skip-region): New region skipping function.
(ispell-tex-arg-end): New tex mode region skipping function.
(ispell-skip-region): New region skipping function.
(ispell-get-line): New function to clean up command loop.
(ispell-process-line): New function cleaning up command loop.
(ispell-continue): Improve recursive editor support.
(ispell-complete-word): Interior fragment support improved.
(ispell-message): Region skipping vastly improved.