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Protect against negative elements on the diagonal of covariance matrices

William Axel Leight requested to merge wleight/athena:negCovFix into master

In rare occasions, the track fit may result in parameters with unphysical covariance matrices. This can occur if the inputs to the fit are themselves unphysical: e.g., ID tracks with pT of hundreds of TeV. This fix adds a protection against such tracks, to avoid crashes down the line. (It was prompted by a crash of exactly this kind in one of the MooPerformance RTT tests.)

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