- make all python potential classes derived from LAMMPSPairPotential
which contains shared functionality. We currently don't check
for supported atom types. may want to add that again later.
- keep track of skipped atom types in the C++ code.
- add test against units setting. must set self.units='...' in constructor
- make compute_force method consistent with Pair::single() in LAMMPS and return force/r instead of force.
- rename potentials.py to py_pot.py
- update test runs. some small tweaks.
Implements a class loader which takes a fully qualified Python class
name, loads the module and creates an object instance.
To add flexibility, the current working directory and the
directory specified by the LAMMPS_POTENTIALS environment variable are
added to the module search path.
Axel Kohlmeyer