Kitware Robot authored Mar 08, 2016 and Dan Lipsa committed Mar 08, 2016

Code extracted from:

    https://gitlab.kitware.com/third-party/proj.git

at commit 41bdf05361007f8c5186f3df9944d86bb273ed13 (for/vtk).

Since the FrontBuffer option was taken out, the testing framework
will first test the backbuffer, and if that fails, then test the front
buffer.

However, if a test fails, the images uploaded to CDash show the wrong
data. For instance:

https://open.cdash.org/testDetails.php?test=373277492&build=4009262

shows the valid image as completely black, while the actual failure:

https://open.cdash.org/testDetails.php?test=374725352&build=4016849

shows that the number of labels displayed has changed.

Many of the OpenGL tests were for RenderingCore API, others were from
RenderingImage and RenderingLabel. Moving them to more appropriate
locations, this makes it easier to validate some of the OpenGL2
implementations now we have a concept of multiple rendering backends.

Change-Id: I48db6a50ddc3d64d899a6b99b8cd21960fa26055

Change-Id: I7c6ab523d022f28256bb9d29e23ebacbcf6eafdd