[Rd] match vs. %in% (PR#853)

[baron@cattell.psych.upenn.edu]

This isn't really a bug so much as an undocumented feature, but
perhaps the help file should be changed.

If you say
match(x,y)
you get the values of the _first_ instance in y that matches each
value of x.

If you say 
x %in% y
you get "TRUE" for every match, not just the first.

This is useful, now that I know it, but perhaps the thing
about the first instance should be documented.

I still don't understand why it happens!

Jon

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