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Added cos(DIRA) to two-track vertex variables

Lorenzo Pica requested to merge lpica_dira_vertex into master

The MR adds the definition and the computation of the cosine of the DIRA, defined as the angle between the PV-SV direction and the vertex momentum.

The code has been compiled and run with both hlt1_pp_definition and hlt1_pp_validation. The variable has also been tested setting:

vertex.dira>0.999 vertex.dira>1.

/device/selections/lines/inclusive_hadron/src/TwoTrackMVALine.cu

In the first case the acceptance for MinBias events is reduced to 61/5000 events, from 82/5000. In the second case the acceptance goes to 0, so the variable should behave as expected.

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