ports/184838: science/silo: Update to version 4.9.1

[danilo at FreeBSD.org]

Synopsis: science/silo: Update to version 4.9.1

Responsible-Changed-From-To: freebsd-ports-bugs->danilo
Responsible-Changed-By: danilo
Responsible-Changed-When: Tue Dec 17 20:32:27 UTC 2013
Responsible-Changed-Why: 
I'll take it.

http://www.freebsd.org/cgi/query-pr.cgi?pr=184838