provide the same naming conventions used in many other low level libraries
I state from @tgal comment:
"Btw. a future notice, I think we can provide the same naming convention is used in many other low level libraries: bestreco(tracks) and argbestreco(tracks). The first gives the data, the second only the mask etc."
the naming of methods in OfflineReader need to be investigated and adapted to the naming conventions used in other low level libraries.