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23.0-cleanup-TrkVKalVrtFitter

Shaun Roe requested to merge sroe/athena:23.0-cleanup-TrkVKalVrtFitter into master

This started as a pure cleanup: replacing usage of std::sort by std::nth_element, and tidying the headers. In the process I discovered there was a small bug resulting in an off-by-one error which increases the median values of the coordinates returned in TrkVKalVrtFitter::VKalVrtFitFast. This MR corrects that bug (and uses std::nth_element); the result might alter the secondary vertexing output. Tagging @kostyuk (with whom I have discussed this).

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