Merge https://github.com/lammps/lammps

cmake/README.md

doc/src/Developer/developer.tex

doc/src/Manual.txt

doc/src/Section_commands.txt

doc/src/fix_enforce2d.txt

doc/src/set.txt

python/lammps.py

src/KOKKOS/Install.sh

src/KOKKOS/fix_enforce2d_kokkos.cpp

src/KOKKOS/fix_enforce2d_kokkos.h

src/KOKKOS/pair_reaxc_kokkos.cpp

src/KOKKOS/pair_reaxc_kokkos.h

src/fix_enforce2d.cpp

src/fix_enforce2d.h

src/read_restart.cpp

src/set.cpp

src/version.h

src/write_restart.cpp