Improve capture quality control

[peterbjornx]

To increase quality of a capture, allowing a second or further pass of confirmation would be useful.

Another missing feature is the ability to mark cells as known bad.

It would be important to have a clear status summary for each group, plane and PLA that shows the number of overlapping, unassigned, unconfirmed, and known bad cells.

Lastly, there should be an export format that tags cells with their quality status to more easily propagate this information to later stages of processing.