Symmetry on limited range

[jbeilstenedmands]

@graeme-winter 's full rotation dataset, with this branch (on ws357)

time dials.symmetry  ''/dls/tmp/gw56/rerun-prot-k/work/DEFAULT/SAD/SWEEP1/integrate/13_integrated.expt'' ''/dls/tmp/gw56/rerun-prot-k/work/DEFAULT/SAD/SWEEP1/integrate/13_integrated.refl'' 'output.experiments='15_symmetrized.expt'' 'output.reflections='15_symmetrized.refl'' 'relative_length_tolerance=0.05' 'absolute_angle_tolerance=2' 'output.json='15_dials_symmetry.json'' exclude_images="0:7200:28800"

...

Recommended space group: P 41 21 2
Space group with equivalent score (enantiomorphic pair): P 43 21 2
Saving reindexed experiments to 15_symmetrized.expt in space group P 41 21 2
Saving 9017966 reindexed reflections to 15_symmetrized.refl

real	3m51.139s
user	1m33.316s
sys	0m40.116s

[graeme-winter]

@jbeilstenedmands looks like a superior solution - no idea why I did not think of taking a copy of the reflection list. Obviously PR still draft but looks like you are headed in a good direction with this.