Add support for sparse ISOs

[bgeery]

AnyDVD supports creating sparse ISOs to save hard disk space when ripping a disc. These ISOs seem to be incompatible with Mezzmo. Please add support for sparse ISOs.

[Peter]

We will rip some sparse DVDs and Blurays here for testing to see what is required to support sparse ISOs.

[Peter]

I tried ripping a BluRay to a sparse ISO using AnyDVD here and Mezzmo read the titles from the ISO correctly. We will try a DVD.

[Peter]

The DVD we ripped with AnyDVD to a sparse ISO also worked. If you enable diagostic logging http://www.mezzmo.com/wiki/doku.php?id=using_logging&s[]=diagnostic then after restarting Mezzmo try adding the ISO to Mezzmo again then send us the logs via email to support [at] conceiva [dot] com we can investigate to see what is happening.