Removed unused debug code.

Change-Id: I4ad3cb55f1b5469970843c0933fd8a28c45c74e8
Made enum public so that it can be accessed by others.

The vtkExtentTranslator::Modes enum was needed by the public
method PieceToExtentThreadSafe(). Made it public.

Change-Id: Ida90380441567f55324e3dffb0406dc7f9b7fadf
Merge topic 'removed-unused-code-2' into master

ff9f9c0a Removed unused debug code.
Merge topic 'made-enum-public' into master

5b13c10e Made enum public so that it can be accessed by others.