corrected typo

Dumux-Svn-Revison: 9988
Ported-By: Andreas Lauser <andreas.lauser@iws.uni-stuttgart.de>
update changelog
remove the README.(source|Debian) files from the debian control files

Arne re-checked that they can be removed without doing harm.
fix doxygen warnings
fix 'make headercheck'
update in-source copyright notices

the bulk of the changes is removing myself from the decoupled stuff,
as I feel that I don't do anything to it which is
copyrightable. lawyers are welcome to disagree.