one more on stable release

Oops, forgot to inlcude the GitHub link listing what

new features are included in the stable release:

And thanks to Richard Berger, Christoph Junghans,

and Axel Kohlmeyer for the CMake bullet on that

list, which was a lot of work to get fully into place

and documented for all the LAMMPS build options.

Please try out a CMake build and give us feedback.