Here is a patch for grid based non-bonded list (and the working grid
code). All the tests pass, yada,yada.
It doesn't build when applied against current SVN:
kernel/include/IMP/score_states/../Grid3D.h: In constructor
'IMP::Grid3D<V>::Grid3D() [with VT = std::vector<IMP::Particle*,
kernel/include/IMP/score_states/../Grid3D.h:220: error: no matching
function for call to 'IMP::Vector3D::Vector3D()'