CSU Jacobi Tests - Clean up

This patch does a few things:
  - #753 renamed 3D->2D, so let's remove everything with the 3D name.
  - #753 also created composite graphs for each dimension, let's remove the individual graphs
  - A test was copied to a new name, but the old was not removed. Let's fix that
  - Remove the old graphs from GRAPHFILES, add the new ones