Rename the class MENU-ITEM to %MENU-ITEM, so that it doesn't clobber the MENU-ITEM presentation type.
Rename the class MENU-ITEM to %MENU-ITEM, so that it doesn't clobber the
MENU-ITEM presentation type.

This is important because we want menus to supersede any inner accepts
in READ-FRAME-COMMAND, so the MENU-ITEM presentation type must not have
applicable translators to any inner type, including EXPRESSION or FORM.
(Fixes menus in the Listener)

informatimago/mcclim,informatimago/mcclim,quek/mcclim,quek/mcclim