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Use matrixnet in 2-track MVA line

Thomas Boettcher requested to merge thboettc_matrixnet into master

This MR adds adds functionality for reading the two-track MVA matrixnet file and uses the output for the 2-track MVA selection. The matrixnet evaluation is very inefficient, so preselections are applied beforehand. The preselections and matrixnet output cut are set to values used in the x86 implementation, resulting in a selected rate of about 1 MHz. This requires loosening the minimum IP chi2 cut in the vertex fitter, leading to a small but significant slowdown.

Throughput tests give 71.0 kHz vs 73.3 kHz on master on a TITAN V.

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