add missing header guards under gtsam_unstable/

gtsam_unstable/base/BTree.h

@@ -17,6 +17,8 @@
  * @date Feb 3, 2010
  */
 
+#pragma once
+
 #include <stack>
 #include <sstream>
 #include <boost/shared_ptr.hpp>

gtsam_unstable/base/Dummy.h

@@ -17,6 +17,8 @@
  * @date June 14, 2012
  */
 
+#pragma once
+
 #include <gtsam/global_includes.h>
 #include <gtsam_unstable/dllexport.h>
 #include <string>

gtsam_unstable/linear/ActiveSetSolver-inl.h

@@ -17,6 +17,8 @@
  * @date     2/11/16
  */
 
+#pragma once
+
 #include <gtsam_unstable/linear/InfeasibleInitialValues.h>
 
 /******************************************************************************/

gtsam_unstable/linear/LPSolver.h

@@ -17,6 +17,8 @@
  * @date     6/16/16
  */
 
+#pragma once
+
 #include <gtsam_unstable/linear/LP.h>
 #include <gtsam_unstable/linear/ActiveSetSolver.h>
 #include <gtsam_unstable/linear/LPInitSolver.h>

gtsam_unstable/linear/QPSolver.h

@@ -17,6 +17,8 @@
  * @date     6/16/16
  */
 
+#pragma once
+
 #include <gtsam_unstable/linear/QP.h>
 #include <gtsam_unstable/linear/ActiveSetSolver.h>
 #include <gtsam_unstable/linear/QPInitSolver.h>

gtsam_unstable/partition/FindSeparator.h

@@ -6,6 +6,8 @@
  *  Description: find the separator of bisectioning for a given graph
  */
 
+#pragma once
+
 #include <map>
 #include <vector>
 #include <boost/optional.hpp>