[Openmm-betatesters] OpenMM 4.1.1

[Peter Eastman]

We have just posted OpenMM 4.1.1.  This is a bug fix update that corrects a few important problems.  In particular, it fixes a performance regression that was introduced in 4.1, and it works on recent Linux distributions that use GCC 4.6.

The release is still marked as hidden.  Before we open it up to the world, we'd like to give all of you a chance to download it first and make sure no problems were introduced while building it.  So please try it out, and email me whether it works for you.  You can get it from https://simtk.org/project/xml/downloads.xml?group_id=161.  Scroll down to the bottom of the section for OpenMM 4.1 and click the link that says, "List all hidden releases."

Thank you!

Peter