added DOCA and other variables to vertex struct, use them in dimuonsoft
Added some variables to vertex, typical for two-track triggers in Run1 & Run2
- V0 IP, and ghost angle variable: calculated only for Dimuons . It can be done for all vertices as well, but as right now is not needed we only do it for muons.
- DOCA, dz: available to all. It is faster to calculate the DOCA right after the poca ((it would be probably even better inside the 'poca' function itself, but that requires to change the number of arguments of 'poca', probably, which seems to me a bigger change to the code))