Fix up --run-donttest and --run-dontrun

git-svn-id: https://svn.r-project.org/R/trunk@67106 00db46b3-68df-0310-9c12-caf00c1e9a41
add example based on the woes of package RJaCGH

git-svn-id: https://svn.r-project.org/R/trunk@67107 00db46b3-68df-0310-9c12-caf00c1e9a41
add details of printf format woes and shells, typos

git-svn-id: https://svn.r-project.org/R/trunk@67109 00db46b3-68df-0310-9c12-caf00c1e9a41
updates

git-svn-id: https://svn.r-project.org/R/trunk@67111 00db46b3-68df-0310-9c12-caf00c1e9a41