Stabilize search_beam_position (#1160)
Stabilize search_beam_position (#1160)

This makes the simplex minimization deterministic (not stable).
The algorithm will appear more stable to our tests.

Fixes #1152

Co-authored-by: Nicholas Devenish <fee099083a967713e343c4e1cd435b89f4338259@gmail.com>
dials/dials,dials/dials,dials/dials,dials/dials,dials/dials