Spell-Check Message menu item

[David Reitter]

The "Spell-Check Message" menu item is enabled all the time - even  
when no message is being edited. Adding a :enabled or :visible here  
would improve usability.

from ispell.el:

      (define-key ispell-menu-map [ispell-message]
        '(menu-item "Spell-Check Message" ispell-message
                    :help "Skip headers and included message text"))


Also, the whole menu is always visible - even when no frame is  
visible at all. Don't forget that menu bars can exist outside of  
frames.