sanity checks for input in permutest.ccalist

git-svn-id: svn+ssh://svn.r-forge.r-project.org/svnroot/vegan/pkg/vegan@2636 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
rename permutest.ccalist to anova.ccalist: function returns an 'anova' table

git-svn-id: svn+ssh://svn.r-forge.r-project.org/svnroot/vegan/pkg/vegan@2637 edb9625f-4e0d-4859-8d74-9fd3b1da38cb