[interfacekit] BDataIO classes

Hi all!
I just committed the last(?) tests for these classes. It took me longer 
than I tought at first, since I made some wrong assumption (If I had done 
unit tests before, I would have finished sooner :))) Anyway, all seems to 
work fine (I even compiled OpenTracker with them, and I'm currently using 
it without problems). I would be glad if someone else threw a look at my 
code, just to be sure I didn't forget anything.

Now I'll concentrate on BString, if no one complains.

Bye!

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