increased required R version, added intercept argument to nice.anova

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/afe@96 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
prin.tmixed warning propagation fixed

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/afe@97 edb9625f-4e0d-4859-8d74-9fd3b1da38cb