added help for parameters, remove _abs and added _raw for thomson ne, added...

added help for parameters, remove _abs and added _raw for thomson ne, added cxrs, fit for conf as default

git-svn-id: https://spcsvn.epfl.ch/repos/TCV/gdat/trunk@5070 d63d8f72-b253-0410-a779-e742ad2e26cf