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Make errUnbiasedResidual always return a positive number.

Daniel Hugo Campora Perez requested to merge fix_unbiasedResidual into 2018-patches

Sometimes, one would see an FPE in OTTrackMonitor due to an Outlier Node returning a negative number in this line:

https://gitlab.cern.ch/lhcb/Rec/blob/master/Tr/TrackMonitors/src/OTTrackMonitor.cpp#L482

This can be avoided making the errUnbiasedResidual always return a positive number.

Edited by Christoph Hasse

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