migrate non-API entry points to stats

git-svn-id: https://svn.r-project.org/R/trunk@61647 00db46b3-68df-0310-9c12-caf00c1e9a41
Link to NEWS.Rd.

git-svn-id: https://svn.r-project.org/R/trunk@61648 00db46b3-68df-0310-9c12-caf00c1e9a41
new mirror in Germany, remove several defunt mirrors

git-svn-id: https://svn.r-project.org/R/trunk@61649 00db46b3-68df-0310-9c12-caf00c1e9a41
Add keep.source arg to parse(); remove it from library() and require(), where it has been deprecated.

git-svn-id: https://svn.r-project.org/R/trunk@61650 00db46b3-68df-0310-9c12-caf00c1e9a41