Updated Copyright

I updated the copyright on the OpenMx website, and the source code. The source code update was done with a few lines of sed at the Unix terminal.

find . -name "*.h" -exec sed -i "s/Copyright 2007-2012 The OpenMx/Copyright 2007-2013 The OpenMx/g" '{}' \;

This finds files in the current directory (.) with the name ending in ".h" and executes sed inplace (-i) editing the copyright (replace "Copyright 2007-2012 The OpenMx" with "Copyright 2007-2013 The OpenMx"). Analogous commands where done in models/passing, demo/, man/, and src/.

"svn up" your source code copies!