From Matevz & Alja

	* base/inc/TVirtualViewer3D.h:
	Add function virtual void ObjectPaint(TObject*, Option_t*).


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	* ged/src/TGedEditor.cxx:
	When adding top-level TGFrame for the extra tabs specify layout
	hints with kLHintsExpandX.


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	* gl/inc/TGLScenePad.h:
	* gl/src/TGLScenePad.cxx:
	Implement virtual TVirtualViewer3D::ObjectPaint().

	* gl/src/TGLCamera.cxx:
	* gl/inc/TGLCamera.h:	
	* gl/src/TGLPerspectiveCamera.cxx:
	* gl/inc/TGLPerspectiveCamera.h:	
	* gl/src/TGLOrthoCamera.cxx:
	* gl/inc/TGLOrthoCamera.h:
	Introduce two transformation matrices to clearly define movement
	of camera around the center point. The first transformation matrix
	fCamBase defines the coordinate system placed at the camera center
	point with camera up-vector as the third base vector. The second
	transformation matrix fCamTrans defines the camera transformation
	relative to fCamBase.

        Implement a common Truck(), Rotate() and Dolly() function for
	orthographic and perspective camera.

	Implement an option to define camera center point
	externally. Center can also be determined via picking.

	* gl/src/TGLUtil.cxx:
	* gl/inc/TGLUtil.h:
	TGLMatrix: add new functions to get/set the base vectors
	directly.

	TGLUtil: add member UInt_t fgDefaultDrawQuality.

	TGLRect: bugfix in Diagonal(), integer calculation overflowed.

	* gl/src/TGLViewer.cxx:
	* gl/inc/TGLViewer.h:
	Make interface to draw camera center point.
	Add option to disable/enable depth test when drawing axis guides. 

	* gl/src/TGLViewerEditor.cxx:
	* gl/inc/TGLViewerEditor.h:
	Add GUI to manipulate camera center and to disable/enable depth
	test when drawing axis guides.

	* gl/src/TGLClipSetEditor.cxx:
	Change layout of labeled number entries.

	* gl/src/TGLLightSet.cxx:
	Fix positioning of front light. White-space consolidation.

	* gl/src/TGLLightSetEditor.cxx:
	* gl/inc/TGLLightSetEditor.h:
        Put GUI for the 6 lights in two columns.


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	* tutorials/gl/glViewerExercise.C:
	Follow-up on changes in TGLCamera. Enable rotation on
	orthographic camera.

	* tutorials/gl/glViewerLOD.C:
	Workourond for cint bug with switch statements.


git-svn-id: http://root.cern.ch/svn/root/trunk@20292 27541ba8-7e3a-0410-8455-c3a389f83636