add David Rossiter's extension (long/lat, Swiss grid, kml)


git-svn-id: svn://svn.r-forge.r-project.org/svnroot/gstat@92 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
tidy


git-svn-id: svn://svn.r-forge.r-project.org/svnroot/gstat@93 edb9625f-4e0d-4859-8d74-9fd3b1da38cb