DiskDevice API v2.4

> Yep, just go ahead. I'm looking forward to seeing an updated version. 
> :-P

Done. :-)

http://www.dauwalder.net/DiskDeviceAPI_v2.4.zip

A few notes:

- I discovered and thus added in DiskDevicePrivate.h from 
headers/private/storage after updating it.

- I changed all int32s to uint32s, since, as Axel mentioned, Amiga can 
have some 4 billion partitions technically speaking, I figured there was 
no reason to skimp on bits due to laziness (which I assume is why all 
the int32s showed up so far; they didn't appear to be needed anywhere to 
allow for negative return values).

- Is your intent to populate a given BPartioningInfo object with data 
once and only once upon the call to BPartition::GetPartitioningInfo(), 
forcing a refresh by getting a new object via another call to 
BPartition::GetPartitioningInfo()? I assumed so thus far in making 
BPartitioningInfo.

- I added in all the iterations of the DiskDevice API headers to our 
cvs, just for good measure.

-Tyler