ports/129863: Update math/R to version 2.8.1

[wxs at FreeBSD.org]

Synopsis: Update math/R to version 2.8.1

Responsible-Changed-From-To: freebsd-ports-bugs->wxs
Responsible-Changed-By: wxs
Responsible-Changed-When: Mon Dec 22 20:19:32 UTC 2008
Responsible-Changed-Why: 
I'll take it.

http://www.freebsd.org/cgi/query-pr.cgi?pr=129863