[Libburn] Libisofs size/position fixes

[Joe Neeman]

I spent a good part of today starting to write a tool for running
regression tests and so on. It's far from finished but it has already
found a few bugs which the attached patch fixes. I'll send the tool
itself when it's progressed a bit more.

Also, as I was writing the tool, I fell in love with the python "struct"
module. The next thing I think I'll do is write a C version of it to use
in libisofs. I think that will make expanding libisofs to other formats
much easier.

The patch applies on top of the patch I sent yesterday.

Joe
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