Prevent out of order frames #298
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Summary of changes
In the aggregator: prevents new frames from being created whose timestamp is earlier than or equal to any that have previously been dispatched. That is, if a digitiser messages arrives late, then if it's frame is still in the cache, it is aggregated into that frame, otherwise it is discarded and a warning emitted.
Closes #288.
Note that we still assume that each frame's initial digitiser message appears in chronological order.
Instruction for review/testing
General code review.
Has been tested on simulated data.