Propagate Mathieu's modif from 1.2 to CVS version.

Propagate Mathieu's modif from 1.2 to CVS version.

ENH: A few stuff:
Do not call ResetCameraClippingRange in VTK5 and above (fixed)
Update to new API for the ZSlicer stuff in vtkImageViewer2
Add a vtkMedicalImageProperties to the writer to pass in medical information from VTK context (pretty neat...)
Minor style, avoid including too many header files

URL : http://cvs.creatis.insa-lyon.fr/viewcvs/viewcvs.cgi/gdcm/?view=query&branch=&who=malaterre&date=explicit&mindate=2006-04-20%2021:20&maxdate=2006-04-20%2021:22