Minor temporary fixes to TPC tracking

 - Ad-hoc correction for time-bin offset.
   Will be corrected eventually by proper transformation class.
 - Due to smearing, clusters may cross the central electrode a bit.
 - Fix missing definitions.

Author: davidrohr

Detectors/TPC/reconstruction/src/TPCCATracking.cxx

@@ -31,6 +31,7 @@
 // class.
 // Therefore, the macros are defined here and not globally, in order not to pollute the global namespace
 #define HLTCA_STANDALONE
+#define HAVE_O2HEADERS
 #define HLTCA_TPC_GEOMETRY_O2
 
 // This class is only a wrapper for the actual tracking contained in the HLT O2 CA Tracking library.
@@ -184,14 +185,16 @@ int TPCCATracking::runTracking(const ClusterNativeAccessFullTPC& clusters, std::
         const PadCentre& padCentre = mapper.padCentre(pad);
         const float localY = padCentre.Y() - (padY - padNumber) * region.getPadWidth();
         const float localYfactor = (cru.side() == Side::A) ? -1.f : 1.f;
-        float zPositionAbs = cluster.getTime() * vzbin;
+        //Add constant offset of 1.6 time bins due to signal shape and binning
+        //To be done properly in the transformation step eventually.
+        float zPositionAbs = (cluster.getTime() - 1.6) * vzbin;
         if (!mTrackingCAO2Interface->GetParamContinuous())
           zPositionAbs = detParam.getTPClength() - zPositionAbs;
         else
           zPositionAbs = sContinuousTFReferenceLength * vzbin - zPositionAbs;
 
         // sanity checks
-        if (zPositionAbs < 0 ||
+        if (zPositionAbs < -2 ||
             (!mTrackingCAO2Interface->GetParamContinuous() && zPositionAbs > detParam.getTPClength())) {
           LOG(INFO) << "Removing cluster " << i << " time: " << cluster.getTime() << ", abs. z: " << zPositionAbs
                     << "\n";

Detectors/TPC/reconstruction/test/testTPCCATracking.cxx

@@ -45,7 +45,7 @@ BOOST_AUTO_TEST_CASE(CATracking_test1)
     cont[i].sector = 0;
     cont[i].globalPadRow = i;
     cont[i].clusters.resize(1);
-    cont[i].clusters[0].setTimeFlags(0, 0);
+    cont[i].clusters[0].setTimeFlags(2, 0);
     cont[i].clusters[0].setPad(0);
     cont[i].clusters[0].setSigmaTime(1);
     cont[i].clusters[0].setSigmaPad(1);