This is a followup to my earlier series, which has been partially applied 
already. Other patches that became obsolete by unrelated refactoring have been 
dropped.

The review comments have been addressed. The nullptr patch should now be 
complete and catch every "0" in qconf.cc and qconf.h. One additional patch has 
been added that removes a constructor overload that would have needed this 
treatment otherwise as well.

Regards,

Eike
-- 
Rolf Eike Beer

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