[test-quadrature] (Re)Throw exceptions out of main instead of doing exit(1).

This has the effect that the standard library will see the exception and will
usually print information about it, such as the type of the exception.

dune/geometry/test/test-quadrature.cc

@@ -234,11 +234,11 @@ int main (int argc, char** argv)
   catch( const Dune::Exception &e )
   {
     std::cerr << e << std::endl;
-    return 1;
+    throw;
   }
   catch (...) {
     std::cerr << "Generic exception!" << std::endl;
-    return 1;
+    throw;
   }
 
   return success ? 0 : 1;