CLEANUP: Dropped dependency on unused LaTeX package in vignette. Using evalCapture() instead of long deprecated evalWithEcho().

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/r-dots@2133 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Wops, do indeed need xcolors.

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/r-dots@2134 edb9625f-4e0d-4859-8d74-9fd3b1da38cb