Changes in 1.8.2

- added log10 button to calculator
- fixe the array calculator to handle cell data
- fixed memory leak in MPI sends for vtkParallelRenderManager
- fixed a "no-input" issue with vtkDistributedDataFilter (D3) 
- fix for non-IceT compositor and offscreen rendering accessing the display
- fix for the Data Caching on the Animation Tab
- fix to updating contour filter scalar range 
- fix for EnSight readers to better handle valid EnSight files
