option to turn off reindexing

[DHekstra]

We are looking at a crystallographic drug fragment screen where a few datasets seem different enough that it is hard to distinguish based on Pointless statistics which indexing solution is the right one. Would it be possible for the user to either

a) make dimple refine both (all) inequivalent indexing solutions,
b) turn off reindexing, or
c) specify which indexing solution to use?

I think any of these options would do.