RObsDat: Returning results as spacetime objects to allow for simpler handling


git-svn-id: svn://svn.r-forge.r-project.org/svnroot/r-hydro@181 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
RObsDat: adding and removing files according to the previous update (introducing spacetime objects)


git-svn-id: svn://svn.r-forge.r-project.org/svnroot/r-hydro@182 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
RObsDat: adding missing documentation file


git-svn-id: svn://svn.r-forge.r-project.org/svnroot/r-hydro@183 edb9625f-4e0d-4859-8d74-9fd3b1da38cb