separate alleles in M2 isActive and account for one-third substitution factor #6821
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Closes #6724
Closes #4885
Closes #3012 @takutosato The 1/3 factor fixes some missed low-AF calls reported on the forum. In effect our active region code was subtracting 5 from alt base qualities.
In addition to recouping some sensitivity it does also increase false positives in DREAM by a bit. However, I looked at these and without exception they were judgment calls that should be considered active, even if they are artifacts. If we made a PoN with the new changes to M2 I'm sure it would catch most of these.