Added
- New `GammaSurface` and `GammaSurfaceCoordinate` classes for generating, visualising and manipulating bicrystal gamma surfaces.
- New `AtomisticTensileTest` and `AtomisticTensileTestCoordinate` classess for generating, visualising and manipulating atomistic tensile tests.
Changed
- Atoms now use default JMOL colours in `AtomisticStructure` visualisation.