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Improved robustness of TrackParticleCompressorTool

Thomas Strebler requested to merge tstreble/athena:TrkCov_compr_inv_fix into master

This MR improves the robustness of the TrackParticleCompressorTool, following some features observed when running with extreme compression levels. It was observed that, even though the determinant of the covariance matrix is guaranteed to be positive, its inverse could be negative due to precision issues in the matrix inversion. The corresponding check is consequently added.

FYI @goblirsc @vcairo

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