fixed memory leak: hits added to fitted track need to be stored in LCIO collection as well and written to file
addresses issue eutelescope/eutelescope#14
fixed (small) memory leak: added a EUTelTrackFitter::Clear() method and implementation in EUTelGBLTrackFit to allow cleanup of object after Fit is done (without deleting the object)
addresses issue eutelescope/eutelescope#14