[PWGCF] Add some QA histos and event selection cut

Add topological cut QA histograms.
Add event selection in MCRec.

Author: fuchuncui

PWGCF/Flow/Tasks/flowEfficiencyCasc.cxx

@@ -68,7 +68,7 @@ struct FlowEfficiencyCasc {
   O2_DEFINE_CONFIGURABLE(cfgtpccrossoverfindable, int, 0, "minimum number of Ratio crossed rows over findable clusters")
   O2_DEFINE_CONFIGURABLE(cfgcheckDauTPC, bool, true, "check daughter tracks TPC or not")
   O2_DEFINE_CONFIGURABLE(cfgcheckDauTOF, bool, false, "check daughter tracks TOF or not")
-  O2_DEFINE_CONFIGURABLE(cfgcheckMCParticle, bool, false, "check the particle and deacy channel is MC true or not")
+  O2_DEFINE_CONFIGURABLE(cfgcheckMCParticle, bool, false, "check the particle and deacy channel is match or not")
   O2_DEFINE_CONFIGURABLE(cfgCasc_rapidity, float, 0.5, "rapidity")
 
   O2_DEFINE_CONFIGURABLE(cfgNSigmatpctof, std::vector<float>, (std::vector<float>{3, 3, 3}), "tpc and tof NSigma for Pion Kaon Proton")
@@ -187,7 +187,6 @@ struct FlowEfficiencyCasc {
     return true;
   }
 
-
   void processRec(MyCollisions::iterator const& collision, V0MCCandidates const& V0s, CascMCCandidates const& Cascades, DaughterTracks const&, soa::Join<aod::CascMCCores, aod::CascMCCollRefs> const&, soa::Join<aod::V0MCCores, aod::V0MCCollRefs> const&)
   {
     registry.fill(HIST("eventCounter"), 0.5);

PWGCF/Flow/Tasks/flowGfwOmegaXi.cxx

@@ -718,8 +718,8 @@ struct FlowGfwOmegaXi {
       if (cfgOutputNUAWeights)
         fWeightsREF->fill(track.phi(), track.eta(), vtxz, track.pt(), cent, 0);
     }
-    double Nch = hLocalDensity->Integral() / 2;
-    registry.fill(HIST("hCentvsNch"), cent, Nch);
+    double nch = hLocalDensity->Integral() / 2;
+    registry.fill(HIST("hCentvsNch"), cent, nch);
     // fill GFW of V0 flow
     for (const auto& v0 : V0s) {
       auto v0posdau = v0.posTrack_as<DaughterTracks>();