R-alpha: wish: segments(.) / arrows(.) should allow an 'lwd = <num>' argument

[Martin Maechler]

(as the subject says).


Actually, I found that

	arrows
	segments
	rect

have no "..." and no "lwd"  argument
whereas

	lines.default
	polygon
	box

do all have a "..." (but no explicit 'lwd')
which they pass to .Internal( c-code )

-------

For anyone who feels like fixing this:

All the relevant code is in  src/main/plot.c,
and the function are

	do_arrows
	do_segments
	do_rect
etc.
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