test: verify brick size is unchanged.
test: verify brick size is unchanged.

If we 'rebrick' the data set to bricks of the same size, it
should therefore not change the brick size.  Assert as much.

git-svn-id: 353be9ac11a1e711854a13efcc2fc17d9d6b83e7@2060 c36c8488-0289-0348-9b64-b301f74bd9a7

BlueBrain/Tuvok,BlueBrain/Tuvok,BlueBrain/Tuvok