[Paraview] Announce ParaView version 1.8.4

[Ken Martin]

You can find ParaView 1.8.4 at www.paraview.org.

Changes in 1.8.4

- Changed the codec for AVI writing again. This time to video1 which
everyone should have.
- Some fixes to the EnSight readers
- BUG: (bug #1508) In the CopySelections method of vtkDataArraySelection,
check whether the array names and settings of the input
vtkDataArraySelection match this one before actually copying.  Without this
change, the EnSight reader was being modified when nothing had actually
changed, and so it was re-executing unnecessarily.

Thanks
Ken