GUI: ask for MLS when saving or viewing high res clouds (added parameter values in progress dialog)

Source: added focalLength parameter for RGBD camera (if not null, it will override the value from the camera)

git-svn-id: http://rtabmap.googlecode.com/svn/trunk/rtabmap@1557 f169173b-cf89-36c8-b27e-44dbe73f0c83

guilib/include/rtabmap/gui/PreferencesDialog.h

@@ -159,6 +159,7 @@ public:
 	Src getSourceRGBD() const; 			// Openni group
 	QString getSourceOpenniDevice() const;            //Openni group
 	Transform getSourceOpenniLocalTransform() const;    //Openni group
+	float getSourceOpenniFocalLength() const; // Openni group
 
 	int getIgnoredDCComponents() const;