Clarifications to the ComputeEfficiency method, not finished but working.

In EudetData.py:
- clearer names in ComputeResiduals
- removed unnecessary index from ComputeResiduals
- I don't see why cluster.GetResiduals is necessary here, but left for now
- is ComputeResiduals badly named? It just counts matched and not
- removed unnecessary scaler from ComputePosition

In ToolBox.py:
- clarified ComputeEfficiency, now defines main, edge and total
- removed buggy "if n_tracks_in_w_edge != n_tracks_in:"

In pyEudetAnalysisOnly.py:
- removed unnecessary "if n_matched!=0:" before ComputeEfficiency
- lowered printout frequency