Added (commented out) marginals class

gtsam.h

@@ -57,9 +57,6 @@
  *  - TODO: Handle gtsam::Rot3M conversions to quaternions
  */
 
-// Everything is in the gtsam namespace, so we avoid copying everything in
-//using namespace gtsam;
-
 namespace gtsam {
 
 //*************************************************************************
@@ -410,6 +407,11 @@ class Ordering {
 	void push_back(size_t key);
 };
 
+// Frank says: this does not work. Why not?
+//class Marginals {
+//	Marginals(const gtsam::NonlinearFactorGraph& graph, const gtsam::Values& solution);
+//};
+
 }///\namespace gtsam
 
 //*************************************************************************