R-alpha: problem with survival4 and ":="

[Ross Ihaka]

I did indeed take := out.  If code is loaded with "library" these can
be converted to <-.

:= was one of those temporary hacks we put in place 5 years ago and
never got around to fixing.  We already have <- and <<- as assignment
operators.  This is one assignment too many (some would say two too
many).

If it is really critical I can put it back.  I only removed the
reference from the table of internal functions, the actual code is
still in place.
	Ross
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