[openbeosstorage] EntryList / entry_refs

I just uploaded EntryList.h, which I belive is finished (it's just a 
abstract class definition).  

On another note, I don't think we're going to be able to do much with some 
of the functions that take entry_refs until we get the new kernel. I have 
yet to figure out a way yet to turn an entry_ref into a file descriptor or 
a pathname with Posix. 

-Tyler

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