Updated copyright headers to contain "at Austin".

Details:
- Updated copyright headers to include "at Austin" in the name of the
  University of Texas.
- Updated the copyright years of a few headers to 2014 (from 2011 and
  2012).
Updated copyright headers (continued).

Details:
- Inserted "at Austin" into third clause of license declarations.
  Meant to include this change in previous commit.
Reverted power7 symlinks destroyed by sed script.

Details:
- Reverted two symlinks, in kernels/power7/3/test, back to being symlinks
  after recursive-sed.sh mistakenly replaced them with copies of the
  actual files to which they referred. Meant to include this in previous
  commit.