Fixed vtkXdmfReader for parallel structured data.

Readers are no longer passed a sub-extent if they say
they support piece requests. Added extent splitting logic.

Change-Id: If245a347cc71b300f9deca6bf66a559f922cc96d
Set the z-spacing in a TIFF to match x-spacing

There is no way to specify the z-spacing, and it seems more logical
to default to something matching the x-spacing rather than defaulting
to 1.0. This will of course result in 1.0 when nothing is specified
in the file.

Change-Id: I6e1f9e4f2f294844a6ed84ba1aa439399f5eb957
Merge topic 'fixed-xdmf-reader' into master

06685ac2 Fixed vtkXdmfReader for parallel structured data.
Catalyst web

Improve query help in composite UI
8 results per page

Change-Id: Ie6d8131f99bb6910b3a491cb4c92390eb374239b
Merge topic 'catalyst-web-composite' into master

5139f277 Catalyst web
Merge topic 'tiff-z-spacing' into master

cebeddb1 Set the z-spacing in a TIFF to match x-spacing
Add new rendering class API based on vtkPanel class

Change-Id: I7cef5d9c9514491ba5aba608a40dac59703bbac5
Merge topic 'vtk-java-rendering' into master

14b1a6e2 Add new rendering class API based on vtkPanel class