fixed debug output and const function type

NSolver/LeastSquaresProblem.cc

@@ -199,7 +199,7 @@ store_result ( const double* _x               )
 
 bool
 LeastSquaresProblem::
-constant_hessian()
+constant_hessian() const
 {
   for(unsigned int i=0; i<terms_.size(); ++i)
   {

NSolver/LeastSquaresProblem.hh

@@ -65,7 +65,7 @@ public:
   virtual void   store_result ( const double* _x               );
 
   // advanced properties
-  virtual bool   constant_hessian();
+  virtual bool   constant_hessian() const;
 
   // advanced usage
   void add_to_gradient   ( const double* _x, double* _g, const double _c);

Solver/MISolver.cc

@@ -203,7 +203,7 @@ MISolver::solve_cplex(
   }
   catch (IloException& e)
   {
-    DEB_warning(2, "CPLEX Concert exception caught: " << e )
+    DEB_warning(2, "CPLEX Concert exception caught: " << e.getMessage() )
   }
   catch (...)
   {