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 <=.

added 1 commit

• 436eb366 - Fix for serial dopair2 in the rare case when the particle separation equals the smoothing length.

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• 3fb08857 - Documentation.

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changed title from Find missing interactions in dopair2_vec to Find missing interactions in DOPAIR2 and vectorized version.

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So that's all fine and been tested extensively (see !443 (merged) that led to these fixes). Just making sure we are not inadvertently breaking anything.

Looks good to me. Accepting. OK to delete the branch?

merged

mentioned in commit 9ddb0c82

Yeah, that's fine with me. Cheers!