[Users] Illinois Contribution to ET: Staggered Prolongation/Restriction

[Zach Etienne]

Dear ET folks,

Our branch of Carpet, which includes the prolongation/restriction
operators we developed for staggered gridfunctions, has been made
publicly available.

You can download it here:
http://webusers.physics.illinois.edu/~vpaschal/UIUC_CARPET/

The license to our modifications and contributions is GPL, chosen to
maximize compatibility with the rest of the Carpet code licensing.
Though we do not intend to merge these changes into the Carpet
mainline, you are more than welcome to do so.

Sincerely,

Zachariah Etienne
Yuk Tung Liu
Vasilis Paschalidis
Stuart L. Shapiro