add aliases for more environment variables

git-svn-id: https://svn.r-project.org/R/trunk@66794 00db46b3-68df-0310-9c12-caf00c1e9a41
grammar

git-svn-id: https://svn.r-project.org/R/trunk@66797 00db46b3-68df-0310-9c12-caf00c1e9a41
clean up some unused assignments

git-svn-id: https://svn.r-project.org/R/trunk@66798 00db46b3-68df-0310-9c12-caf00c1e9a41
update

git-svn-id: https://svn.r-project.org/R/trunk@66799 00db46b3-68df-0310-9c12-caf00c1e9a41
R CMD Rd2pdf --os was ignored

git-svn-id: https://svn.r-project.org/R/trunk@66800 00db46b3-68df-0310-9c12-caf00c1e9a41
tweak

git-svn-id: https://svn.r-project.org/R/trunk@66802 00db46b3-68df-0310-9c12-caf00c1e9a41