add slam_gmapping

slam_gmapping/openslam_gmapping/scanmatcher/smmap.cpp

@@ -0,0 +1,15 @@
+#include <gmapping/scanmatcher/smmap.h>
+
+namespace GMapping {
+
+const PointAccumulator& PointAccumulator::Unknown(){
+	if (! unknown_ptr)
+		unknown_ptr=new PointAccumulator;
+	return *unknown_ptr;
+}
+
+PointAccumulator* PointAccumulator::unknown_ptr=0;
+
+};
+
+