Add possibility to enable time gain calibration

This PR enables the option to create the time gain calibration objects by setting ALIEN_JDL_DOTPCTIMEGAINCALIB=1.
The output files are named `o2tpc_CalibratordEdx_Histos_<run>_<startTime>_<endTime>_<startTF>_<endTF>.root` and need to be merged afterwards to get enough statistics for the fits.

Author: matthias-kleiner

DATA/production/configurations/asyncReco/async_pass.sh

@@ -205,6 +205,10 @@ if [[ "$ALIEN_JDL_EXTRACTTIMESERIES" == "1" ]]; then
   export ADD_CALIB=1
 fi
 
+if [[ "$ALIEN_JDL_DOTPCTIMEGAINCALIB" == "1" ]]; then
+  export ADD_CALIB=1
+fi
+
 # AOD file size
 if [[ -n "$ALIEN_JDL_AODFILESIZE" ]]; then
   export AOD_FILE_SIZE="$ALIEN_JDL_AODFILESIZE"

DATA/production/configurations/asyncReco/setenv_extra.sh

@@ -761,6 +761,16 @@ if [[ $ADD_CALIB == "1" ]]; then
   if [[ $ALIEN_JDL_DOUPLOADSLOCALLY == 1 ]]; then
     export CCDB_POPULATOR_UPLOAD_PATH="file://$PWD"
   fi
+
+  # enable time gain calibration
+  if [[ $ALIEN_JDL_DOTPCTIMEGAINCALIB == 1 ]]; then
+    echo "Enabling TPC time gain calibration"
+    export CALIB_TPC_TIMEGAIN=1
+    export ARGS_EXTRA_PROCESS_o2_tpc_calibrator_dedx+=" --dump-histograms 1 --min-entries 1" # write full calibration objects for time gain without rejecting low statistics timeslots
+    export ARGS_EXTRA_PROCESS_o2_tpc_miptrack_filter+=" --use-global-tracks"
+    export SCALEEVENTS_TPC_TIMEGAIN=1 # use all TFs
+    export SCALETRACKS_TPC_TIMEGAIN=-1 # use all tracks
+  fi
 fi
 
 # Enabling AOD