[Users] Completing GetComponents' transition to GitHub

Hi,

with the new release of the Einstein Toolkit complete, I think we can finally complete the transition of GetComponents to GitHub. This would involve two things.

1. Applying the attached patch to the ET trunk thornlist. It would just add the GetComponents GitHub repository, and symlink GetComponents into the root of the ET source tree. There was an issue with this previously, where the symlink did not work, but that was fixed a few months ago.

2. Deleting the svn version of GetComponents in utils/Scripts.

There would be no functional changes to GetComponents as the two versions are mirrored, users would simply have to call GetComponents from the root directory now.

Eric