Correct the handling of s1d.* functions when there is only one value in score

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/ade4@685 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Simplify the code for the handling of TL/TC

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/ade4@686 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
New function 'adegraphicsLoaded' to test if adegraphics is loaded

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/ade4@687 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Update figures in the vignette with the new 'C1.*' class

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/ade4@688 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Correct the 's1d.boxplot' definition in its help file

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/ade4@689 edb9625f-4e0d-4859-8d74-9fd3b1da38cb