[Rd] "keep.source" changes committed to R-devel

[Martin Maechler]

These are the NEWS entries

    o	library(), require(), and sys.source() have a new argument
	` keep.source = getOption("keep.source") '.
	Hence, by default, functions from all packages (not just base)
	`keep their source'

    o	The "keep.source" option now defaults to interactive() instead of TRUE.


Note that this (the 2nd one!) speeded up  "make check" a bit (about 1-2 %).

What is *not* yet working is
     "keep.source = FALSE  having an effect on the functions in base.

Martin

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