SGA updated to include new proportion-based insert size test.
Major fix for dichotomization test: MathUtils now optionally ignores NaN values for sums, averages, variances. In the future this feature can be pushed back into the AssociationContext object iself (e.g. no data? no entry), but it's kept like this for transparency for now.
git-svn-id: file:///humgen/gsa-scr1/gsa-engineering/svn_contents/trunk@5618 348d0f76-0448-11de-a6fe-93d51630548a
rpoplin
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