removed vector copy constructor from Newton constructor again, since it lead...

removed vector copy constructor from Newton constructor again, since it lead to exceptions. Has to be reconsidered for the pdelabadapter thing.

git-svn-id: svn://svn.iws.uni-stuttgart.de/DUMUX/dumux/trunk@4581 2fb0f335-1f38-0410-981e-8018bf24f1b0