Tim Jansen - 2001-02-01

I have submitted three patches. The first two fix some smaller bugs, and the third tries to reconstruct the intention of the hierarchy example. It seems to work now, but I dont know whether it is now the way it was intended to work. I also changed some things in the doxygen docs that seemed wrong to me and tried to clarify exactly when a Test is registered in the TestRegistry and when not (as English is not my native tongue please correct it if neccessary).