- Implementing Central task for filtering the ESD friends:
- keeping only 1% of the whole sample, randomly selected
- Adding the setting/getting of the "skip" bit (bit 23) for AliESDfriendTrack/AliESDfriend
during the filtering
- AliESDfriendTrack --> to allow to have the logical or between tracks from different tasks
when adding a "dummy" friend track (when not selected by the filter)
- AliESDfriend --> to be able to disentagle between ESDfriends added because
selected, or added as "dummy" ones when not selected
- Corresponding changes in AliAnalysisTaskFilter/AliESDHandler and in the
example filtering tasks
- Removal of AliAnalysisFilterSTEER:
- the 1% selection is now done in AliAnalysisFilterSteer
- the pt selection should be handled in separate detector-specific tasks