manualInst.vignette() now checks the version; update: bib: R (2014)

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/pcalg@234 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Corrected skeleton test

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/pcalg@235 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
less output in test_backdoor.R

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/pcalg@236 edb9625f-4e0d-4859-8d74-9fd3b1da38cb