Installation scripts and docs reviewed for release

Adds tutorial for using LAMMPS in Bash on Windows

Fixed typo in "compute_voronoi_atom.txt"

There was the typo "requiers" in the Restrictions section of compute_voronoi_atom.txt.

- build into local directory to replace existing installation is now default
- add wrapper function that calls curl in case python package has not ssl support
- have to specify -n flag to avoid wiping out the existing installation
- can specify -p to point to an existing kim-api installation (implies -n)

PyLammps corrections

Also fixes some regressions due to command syntax changes

restore lost KIM doc section in Section packages

last minute changes for stable release