Slight change in the iteration condition of the calculateEigenValues

functions

   - The relative criterion for convergence of the iterative algorithm
     can no be given as function argumenti

   - approved by Bernd



git-svn-id: svn://svn.iws.uni-stuttgart.de/DUMUX/dumux/trunk@11496 2fb0f335-1f38-0410-981e-8018bf24f1b0