Update copyright year in manuals

Mikko Korpela <mikko.korpela at helsinki.fi>
    on Thu, 23 Feb 2017 14:02:58 +0200 writes:

> With new R releases soon to come, I suggest updating the
    > Rcopyright macro in "doc/manual/R-defs.texi" to use year
    > 2017.

Now this is an e-mail that *REALLY* does not fit to the R-devel
mailing list ... even though it is very very slightly related to
the R sources.

We do *not* want noise on R-devel, please.

(and let's continue this issue in private if you want)
Martin