[patch] fix c++ compilation warnings and test cases

[Tom Tromey]

>>>>> "Andreas" == Andreas Tobler <toa@pop.agri.ch> writes:

Andreas> Right now all *.cc testcases fail due to the ? redundant ?
Andreas> declarations in Class.h. Also the compilation of the *.cc
Andreas> source files spits this warning:

It seems to me that declarations which are merely redundant shouldn't
cause a warning, unless we have some -W asking for a warning (I didn't
look).

Andreas> Tom, does the // Friend classes comment only belong to the
Andreas> declarations I'd like to remove or also to the following ones?

It is ok to delete the comment.

Andreas> Ok for main?

Yes.  Thanks.

Tom