The new version of kDebug() & family.

This now uses QDebug for output, as opposed to the previous, own class. This also means that it automatically adds spaces, the final newline. And you can use all QTextStream manipulators. No more QVariant-based stuff either.

Drawback: we cannot override Qt's operator<< functions that already exist.

Temporarily, this new code eats up final newlines from kDebug (but not other outputs). As soon as the "endl" are gone, I'll remove this temporary code.