Change to Default Video Format

I have made a change to the default specification of the video format.

Previously, the format would default to NTSC unless PAL was specified. 
Now you can build the source to default to NTSC or PAL, or not to 
default at all. This is controlled by the new 
--enable-default-video-format configure option, thus:

     --enable-default-video-format=NTSC
         gives you the old behaviour (default to NTSC)
     --enable-default-video-format=PAL
         defaults to PAL

Or omit this option altogether to have no default.

Having no default means you are now liable to get errors where things 
might have worked before. Specifically, every <menus> and <titles> 
section will have to have a <video> tag specifying whether the format is 
PAL or NTSC, even if there are no <vob>s in that section.

There were some places before, namely the generation of PGCs without 
video, where NTSC frame rate calculations were used even when authoring 
PAL discs. This probably makes no noticeable difference to any players, 
but these places can now use PAL settings where appropriate.

Let me know what you think of this change.

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