Updated Copyright information

Used the following commands:

    sed -i "" -e 's/Copyright (c) 2001-2007/Copyright (c) 2001-2013/g' **/*.som
    sed -i "" -e 's/Copyright (c) 2001-2008/Copyright (c) 2001-2013/g' **/*.som
    sed -i "" -e 's/Copyright (c) 2001-2009/Copyright (c) 2001-2013/g' **/*.som
    sed -i "" -e 's/Copyright (c) 2007 Michael Haupt, Tobias Pape/Copyright (c) 2007-2013 see AUTHORS file/g' **/*.som
    sed -i "" -e 's/Copyright (c) 2009 Michael Haupt/Copyright (c) 2009-2013 see AUTHORS file/g' **/*.som

Signed-off-by: Stefan Marr <git@stefan-marr.de>