math/jags: 3.4.0 -> 4.0.0

• New WWW
• Changes: https://martynplummer.wordpress.com/2015/08/02/whats-new-in-jags-4-0-0-part-14-reproducibility-and-testing/ https://martynplummer.wordpress.com/2015/08/09/whats-new-in-jags-4-0-0-part-24-dealing-with-undefined-nodes/ https://martynplummer.wordpress.com/2015/08/16/whats-new-in-jags-4-0-0-part-34-r-style-features/#more-353

PR: 204525
Submitted by: Rainer Hurling <rhurlin@gwdg.de>
Approved by: bf