Auto-action buttons can have spatial extents too

The DVD spec allows for buttons in a menu to be of the “auto-action” 
type. That means as soon as you move to such a button, it will perform 
its action. Such buttons are useful, for example, to implement “next 
screen” and “previous screen” functions where a menu would too many 
items to fit them all on one screen.

The current official version of dvdauthor does not allow you to define 
spatial extents for auto-action buttons. Actually there is a bug in 
dvdunauthor where it does not implement this consistently, which leads 
to a failure trying to run spuunmux on its output.

I have done a test involving both VLC and my DVD player, to confirm that 
dvdauthor is wrong not to allow spatial extents for auto-action buttons: 
both players do indeed briefly highlight the visible area of the button 
before actually performing its action. Therefore I have implemented a 
patch to my version of dvdauthor to remove this distinction completely.

This means a corresponding change to the spumux XML syntax, to allow all 
the same spatial attributes on the “action” tag as on the “button” tag:

         <button [ name="name" ] [ x0="x0" ] [ y0="y0" ] [ x1="x1" ]
                 [ y1="y1" ] [ up="name" ] [ down="name" ]
                 [ left="name" ] [ right="name" ] />
         <action [ name="name" ] [ x0="x0" ] [ y0="y0" ] [ x1="x1" ]
                 [ y1="y1" ] />

Though I have yet to update the man page to reflect this. :)

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