Update to USER-MANIFOLD gaussian bump

Fix Memory Leak in Kokkos NeighList

Collected small bugfixes and updates

Add folder .github containing administrative files for use with GitHub

rather than placing an if statement around every incidence of calling atom->check_mass() to ensure it is only called when per atom masses are not set, we place that check _inside_ Atom::check_mass(). This avoids unexpected error messages.

This is still a draft and in need of editing, proofreading and testing for formatting.

doc page clarifications for CHARMM energy and dipole pre-factors

use CHARMM energy conversion factor with new CHARMM pair styles

reword the kspace_modify fftbench keyword docs to reflect the current state (i.e. off by default) of code

fix issue with rRESPA inner/middle neighbor lists

Collected small changes and bugfixes