Merge branch 'fix/exception-handling' into 'master'

Some improvements on exception handling

See merge request !74

dune/elasticity/assemblers/localadolcstiffness.hh

@@ -77,7 +77,7 @@ energy(const LocalView& localView,
         energy = localEnergy_->energy(localView,localAConfiguration);
     } catch (Dune::Exception &e) {
         trace_off();
-        throw e;
+        throw;
     }
 
     energy >>= pureEnergy;

dune/elasticity/materials/mooneyrivlindensity.hh

@@ -88,7 +88,7 @@ public:
     field_type detF = gradient.determinant();
 
     if (detF < 0)
-      DUNE_THROW( Dune::Exception, "det(F) < 0, so it is not possible to calculate the MooneyRivlinEnergy.");
+      DUNE_THROW( Dune::MathError, "det(F) < 0, so it is not possible to calculate the MooneyRivlinEnergy.");
 
     // Add the local energy density
     field_type strainEnergy = 0;