First try of using simple Vertex finding
Minor bug fix in SRecTrack::swimToVertex()
Bug fix in VertexFit with z_vertex fixed at center and disabled the target/dump hypothesis
Merge branch 'naive_vertex_finding' into adding_fast_vertexing
Using dimuon vertex finding indead of sum of single muon vertex as the starting point
Added fast vertex finding with dimuons and use the result as seed