made clear that Error(id/(a*b)) == Error(id/a*b) for aov.car()

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/afe@139 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
aov.car() transforms id to factor automatically

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/afe@140 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
escaped URL in documentation

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/afe@141 edb9625f-4e0d-4859-8d74-9fd3b1da38cb