[mythtv] Preview images in mythweb

[Chris Petersen]

> GD is just an option tho', so the same problem as highlighted above with 
> IM/convert.

yup.  GD might actually be fine, though, since it does come built into 
PHP and can be obtained easily via packages.  I'm used to doing complex 
manipulations that GD can't handle, but for basic png->jpg type 
conversions, it should be just fine.

> Mythweb could however scale the images if the functions/programs are 
> there and use full size if not....? Just a suggestion....

Yeah.  Not before .19, though.

-Chris