Removed a few remaining Cg related files

They were not being used anywhere, cleaning them up.

Change-Id: I4ce1f11f92e0259fb69648d7a0e58dd26f4cb28f
BUG: fix some xdmf writer crashes

- Sets the number of output ports to 0, which avoid an error message in
  Paraview because the writer is used in a pipeline.
- Manages a potential null pointer, avoiding a crash which occurs when the
  user unchecks some blocks in Paraview for instance.

Change-Id: I09c69bc6ac715bcb4297df4e2a012514a7817c57
Add support for original ids for generic dataset

Original point and cell ids were not computed for generic
dataset because the arrays were not initialized.

Change-Id: I16245f0d766ae11345a784335629c69095821898
Added caching to temporal interpolator.

The temporal interpolator did not cache its input, causing it
to request the input repeatedly when streaming over time. Fixed.

Change-Id: Iacb8219f8ec95bc04f69ab301eb4ccb606a6873e
Remove usage of the keyword with to allow old python

Change-Id: I9661715be9fee31060c1959d4044c953d3d88185
Merge topic 'bug_xdmf_writer' into master

0679bf40 BUG: fix some xdmf writer crashes
Merge topic 'bug_dataset_surface_filter' into master

3c7c0824 Add support for original ids for generic dataset
Merge topic 'temporal-interpolator-caching' into master

ad3b1a24 Added caching to temporal interpolator.
Merge topic 'fix-test-for-old-python' into master

3e71420c Remove usage of the keyword with to allow old python
Merge topic 'remove-cg-remains' into master

47bcdf2f Removed a few remaining Cg related files