Properly initialise all members in constructor

dune/solvers/solvers/quadraticipopt.hh

@@ -648,6 +648,7 @@ public:
 
     /** \brief Default constructor */
     QuadraticIPOptSolver () : LinearSolver<MatrixType,VectorType>(NumProc::FULL),
+                              tolerance_(1e-8), maxIterations_(100),
                               hessian_(NULL), rhs_(NULL),
                               obstacles_(NULL),
                               linearSolverType_(""),