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A general description is here.
detach/unloadNamespace() arrange to flush the package's lazyload cache of R objects once the package/namespace is no longer needed.
abline(*, untf=TRUE) now uses a better x-grid in log-scale, e.g., for plot(c(1,300), c(1,300), log="xy") ; abline(4,1, untf=TRUE).
Rcmd INSTALL once again uses --no-restore, for consistency with the Unix version and R 2.9.2.