[Openmm-betatesters] OpenMM 4.1. release candidate

[Peter Eastman]

A release candidate for OpenMM 4.1 is now posted on the downloads page.  As before, click the "List all hidden releases" link to see it.  It has a few more bug fixes and changes based on feedback from all of you, and could become the official release of no serious problems are found.  Give it a try, and let me know if it works for you.

Peter