message: Add reading of container with association
  Adding the possibility to read the container filled only with reconstructed candidates associate to the MC truth in case of MC production check
diff: // ------------------------
  // -- collidingsystem = 0) PbPb 1) pp/pPb
  // -- isMC = kTRUE if running on MC production
  +// -- mcass = kTRUE if want association for MC reconstructed particles
  // -- fileDir = "Input file directory"
  //
  //
  // -- 16 = Proper length distribution for the cascade
  // -- 17 = Proper length distribution for the V0
  // -- 18 = Min V0 Cosine Of PA To Xi Vertex
  -// The last two variables are empty in the case proton-proton collisions.
  -// In case of MC production one more CFContainer is produced, containing infos on the
  -// generated particles. As the previous container, this one is composed by 4 steps, one
  -// for each cascade and 6 variables:
  +// In case of MC production a second equivalent CFContainer is produced but requiring
  +// the MC association to the reconstructed casacde candidates and one more CFContainer
  +// is produced, containing infos on the generated particles. As the previous containers,
  +// this one is composed by 4 steps, one for each cascade and 6 variables:
  // -- 0 = Total momentum
  // -- 1 = Transverse momentum
  // -- 2 = Rapidity
  @@ -94,6 +95,7 @@ class AliCFContainer;
  //=================
  void PostProcessQAMultistrange(Int_t collidingsystem = 1, // 0) PbPb 1) pp/pPb
  Bool_t isMC = kFALSE, // kTRUE-->MC and kFALSE-->Exp.
  + Bool_t mcass = kFALSE, // if kTRUE use container with MC association
  Char_t *fileDir = ".", // Input file directory
  Char_t *output = "pdf" // "eps", "png" or "pdf"
  ) {
  @@ -115,7 +117,9 @@ void PostProcessQAMultistrange(Int_t collidingsystem = 1,
  //_________________________________
  //SOURCE THE FILE AND THE CONTAINER
  TFile *f = new TFile(Form("%s/AnalysisResults.root",fileDir));
  - AliCFContainer *cf = (AliCFContainer*) (f->Get("PWGLFStrangeness.outputCheckCascade/fCFContCascadeCuts"));
  + AliCFContainer *cf = 0x0;
  + if (isMC && mcass) cf = (AliCFContainer*) (f->Get("PWGLFStrangeness.outputCheckCascade/fCFContCascadeMCCuts"));
  + else cf = (AliCFContainer*) (f->Get("PWGLFStrangeness.outputCheckCascade/fCFContCascadeCuts"));
  //___________
  //DEFINE TEXT
  