Spanned zip add dialog

[billy.oneal]

Add an option for DVD sizes in the presets of this list.
Right now the largest it reads is 700MB for CDs.

Might as well add BD and HD-DVD to this as well, though I dont use those personally.

This is an issue because PA uses KiB (2^10), while the DVD standard uses KB. (10^3) (For the difference, see http://en.wikipedia.org/wiki/KiB)

This would be really useful for backing up large amounts of data.

Billy3