Detailed changes:
> 	Fixed bug 1520:
> 	* lyskom-buttons.el (lyskom-button-menu): Pass filter to functions
> 	that build menus.
> 	(lyskom-make-button-menu): Changed old-style backquote to
> 	new-style backquote. Removed function quotes.
>
> 	* vars.el.in (lyskom-button-actions): Introduced filter function
> 	for the context menu.
>