cloudFromDepth(): fixed roi ratios not used if one value was null. DbViewer: Added occupancy grid clouds to 3d views, add action to regenerate occupancy grids only for the current selected ids.

guilib/include/rtabmap/gui/DatabaseViewer.h

@@ -84,6 +84,7 @@ private slots:
 	void generateTOROGraph();
 	void generateG2OGraph();
 	void regenerateLocalMaps();
+	void regenerateCurrentLocalMaps();
 	void view3DMap();
 	void view3DLaserScans();
 	void generate3DMap();