PFile & Directory reading

[Christian Reiniger <warewolf@mayn.de>]

I just committed PenguinFile's directory reading code. It compiles and
seems to work so far (I haven't tested it extensively though). 

The docs aren't updated yet (I hope I'll have that done tomorrow evening),
but the usage is pretty straightforward. The API almost completely clones
the normal POSIX opendir/readdir/stat etc functions. For the differences
have a quick look at PenguinFile.h


	Christian

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