add single options to create_bonds command

Have extra/XXX/per/atom set by keyword to the read_data command

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

change the handling of reading "extra XXX per atom", so that the final choice is the larger of the value in the file and the keyword

Revert "added feature to write_data.cpp to support "extra bonds" (angles,dihedrals,impropers,special)."

This reverts commit 0c2f7c74.

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