adjustments to handle case when a site package version is needed in RSITE from github, not yet on CRAN. Some simplification of LIB environment variables.

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/automater@213 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Documentation adjustment for some simplification of LIB environment variables.

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/automater@214 edb9625f-4e0d-4859-8d74-9fd3b1da38cb