[vtkusers] Proposed style changes

[Glen Lehmann]

Hi All,

This may seem a little on the nit-picky side but I would like to
propose a few style changes to some of the vtk header files.  I have
an Xcode project that would be greatly simplified if all of the vtk
header files stuck to the following convention:

#ifndef __[vtkClassName]_h
#define __[vtkClassName]_h

class ...

#endif

The following is a list of header files that deviate from this convention:

vtkActorCollection.h
vtkCocoaGLView.h
vtkgl.h
vtkGradientFilter.h
vtkImageLaplacian.h
vtkLightCollection.h
vtkMaterialLibrary.h
vtkMeshQuality.h
vtkMutexLock.h
vtkOpenGLExtensionManager.h
vtkPointSetSource.h
vtkPropCollection.h
vtkUnstructuredGridVolumeRayCastIterator.h

If there are no objections to these changes, I will commit the fixes tomorrow.

Cheers,

Glen