- 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)

last minute changes for stable release

LICENSE: update address of Free Software Foundation

Add a (contrived) molecular example for USER-QUIP

Collected bug fixes and small updates

- expand comments to provide more details on the choice of exclusion settings
- comment out dump file generation

This example showcases the use of different 'special_bonds' settings for
different pair styles, so quip gets all the bonded neighbours but lj can
exclude them if it needs to.

The results have been checked against a pure quip implementation of the
potential; the expected lammps output is included.

DISCLAIMER: This example mixes parameters for methane and silane and is
NOT intended to be a realistic representation of either system.

we may make this a run time setting by connecting this code to a command.