Reduce memory usage and calculate statistics online/incrementally #103
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This PR changes the way ReBench handles data.
It fixes #100.
The key idea is to avoid keeping all data points and measurements in memory.
This is achieved by calculating statistics incrementally.
One major change related to it is how we discard data for reruns, which is now fused with loading that data file. This may speedup data loading, too.
@daumayr this should hopefully fix your issue.