Add macro to print/dump alignment matrices in human readable text form

macro/print_alignment.C

+
+Bool_t print_alignment( std::string geoSetupTag )
+{
+  TString srcDir = gSystem->Getenv("VMCWORKDIR");  // top source directory
+  TString alignmentMatrixFileName = srcDir + "/parameters/mcbm/AlignmentMatrices_" + geoSetupTag + ".root";
+  if (alignmentMatrixFileName.Length() != 0) {
+    std::cout << "Reading alignment for file " << alignmentMatrixFileName << std::endl;
+
+    // Define the basic structure which needs to be filled with information
+    // This structure is stored in the output file and later passed to the
+    // FairRoot framework to do the (miss)alignment
+    std::map<std::string, TGeoHMatrix>* matrices{nullptr};
+
+    // read matrices from disk
+    std::cout << "Filename: " << alignmentMatrixFileName << std::endl;
+    TFile* misalignmentMatrixRootfile = new TFile(alignmentMatrixFileName, "READ");
+    if (misalignmentMatrixRootfile->IsOpen()) {
+      gDirectory->GetObject("MisalignMatrices", matrices);
+      misalignmentMatrixRootfile->Close();
+
+      for( auto it = matrices->begin(); it != matrices->end(); ++it) {
+        std::cout << "===========================" << std::endl;
+        std::cout << it->first << std::endl;
+        it->second.Print();
+        std::cout << "===========================" << std::endl;
+      }
+    }
+    else {
+      std::cout << "Could not open file " << alignmentMatrixFileName << "\n Exiting" << std::endl;
+      return kFALSE;
+    }
+
+  }
+  return kTRUE;
+}