Find missing interactions in DOPAIR2 and vectorized version.
Fixes three small bugs in the neighbour search:
- Don't remove rshift from hi_max and pass h_max to populate_max_index_no_cache_force.
- Fixes missing interactions in runner_dopair2_force_vec.
- Fixes missing interactions in DOPAIR2 due to < versus <=.
Edited by Matthieu Schaller