[Common] Adding dimuon DCA histograms

Dimuon DCA histograms are added to investigate different MCH geometries and its effect on the reconstruction of J/psi mesons.

In addition, two bugs were found and fixed:
- Using top/bottom checks for left/right histograms
- Filling the wrong vector for one of the two dimuons in the case of reference (no realign) geometry.

Author: ppoava