update


git-svn-id: svn://svn.r-forge.r-project.org/svnroot/gstat@77 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
added na.action = na.fail, email from Robert Hijmans


git-svn-id: svn://svn.r-forge.r-project.org/svnroot/gstat@78 edb9625f-4e0d-4859-8d74-9fd3b1da38cb