add a tutorial and copy tutorial.html to crpp web, created page: http://crpp,epfl,ch/~sauter/gdat linked to this tutorial

git-svn-id: https://spcsvn.epfl.ch/repos/TCV/gdat/trunk@4880 d63d8f72-b253-0410-a779-e742ad2e26cf

starting version of gdat, gdat_tcv working relativelz well but not yet with all data_request keywords copied from previous loadTCV, returns also list of data request names for aug

git-svn-id: https://spcsvn.epfl.ch/repos/TCV/gdat/trunk@4879 d63d8f72-b253-0410-a779-e742ad2e26cf

git-svn-id: https://spcsvn.epfl.ch/repos/TCV/gdat/trunk@4868 d63d8f72-b253-0410-a779-e742ad2e26cf