BUG #13806. Remove min/max/mean from FindData.

Min/Max/Mean has issues with composite datasets (they work on per block basis
  which is not what the users expect), and they have MPI-related issues in
parallel esp. for composite datasets. Until those issues are fixed, we are
removing min/max/mean from the UI.

Change-Id: I593451d12ed7da75cafc1d44025aa483ce203a23
Merge topic '13806_remove_items_from_find_data' into next

518b34b BUG #13806. Remove min/max/mean from FindData.
BUG #13809. Release graphics resources cleanly.

vtkIceTSynchronizedRenderers and vtkEDLShading were not releasing graphics
resources when context was destroyed. That meant invalid graphics objects were
being used. When saving animations, screen is often resized and hence new
graphics context is created. That resulted in segfaults due to the use of bogus
graphics resources. Fixed that.

Change-Id: I186bc35984ceb1083f0d28cceecd7566bc8df643
Merge topic '13809_fix_edl_segfault' into next

f63737a BUG #13809. Release graphics resources cleanly.