Fixing copyright issues and code contributors

Added Mark Abraham, Christoph Junghans and
Carsten Kutzner to the list of code contributors,
per discussion with Erik and Berk.

* Now that 2013 is a copyrightable year, we need to
  assert that copyright
* No, we can't just say 1995-2013, unless we also say
  that every year in the range is a copyrightable year. I'm
  not interested in demonstrating after the fact that this is
  true for all the years before I was born. So we may as
  well start listing explicit years.
  Please read "howto (L)GPL" guides before arguing :-)
* Removed erroneous GROMACS copyright statements on
  unmodified FindBLAS.cmake,FindLAPACK.cmake,
  FindOpenMP.cmake and slightly modified FindGit.cmake
* Note Szilard's uncertainty about the origin of
  vectype_ops.cuh and thus its copyright status
* TODO for 4.6.1 deal with material in admin and scripts

References #818

Change-Id: I946200651de7f05c2ff292fcded8f33fca7b356f