[CMake]

Add test_co2 and test_co2ni to testing system.
They still fail because the output has strange names. We should fix that
first and maybe shorten the runtime of the tests.
(reviewed by vishal)


git-svn-id: svn://svn.iws.uni-stuttgart.de/DUMUX/dumux/trunk@9227 2fb0f335-1f38-0410-981e-8018bf24f1b0