mention n=1 default


git-svn-id: https://svn.r-project.org/R/trunk@63523 00db46b3-68df-0310-9c12-caf00c1e9a41
Minor rearrangement and added #ifdef RMIN_ONLY to support minimal build.


git-svn-id: https://svn.r-project.org/R/trunk@63524 00db46b3-68df-0310-9c12-caf00c1e9a41