Improve scanning coverage calculation #118
Merged
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Before this PR the scanning coverage calculation uses the total number of applications at the end of the period
when calculation scanning coverage - this can lead to misleading results if the number of applications is
increasing from period to period (underestimating scanning coverage if the application count is increasing).
After this PR the scanning coverage calculation calculates the ratio of scanned/total applications for each
period and then averages that ratio across the whole period.