WIP: fix MCLinking in TDR branch for LHCb::Tracks

@sponce , @raaij , @sstahl The solution I adopted to restore MCLinking for the LHCb::Tracks -> vector conversion, is to append in the MCSequence an algorithm reading all the tracks in the Track container and make a copy of them in /Copy/Track. This allow to run the PrChecker without any issue. Maybe this can be extended to other algorithm which do not allow to merge TDR to master. @gligorov , you may need this hack to setup a timing & efficiency test for CPU using the exact same software stack. To - do -list

• Make the TrackConverter (move to functional) a 1-to-1 conversion One path In , One path Out (KeyedTrack) chained by the PrTrackAssociator using single containers. The final MCChecking sequence will be Per track type produced, i.e. MCCHeckingVelo, MCCheckingUpstream, MCCheckingForward, where optionally, whether no KeyedContainer is produced, a converter is placed in the sequence.
• Let TrackSys and UpgradeChecking sequence to know where converted Keyed tracks are located and which tracks have to be converted (this depends on the signature of the HLT algorithms, i.e. if they produce LHCb::Tracks or vectorLHCb::Track

Now, you can pass TrackSys().TracksToConvert = ["Velo","Upstream","ForwardFast"] to convert from vector<Track> to LHCb::Tracks when doing MC association. Also TrackSys().VeloUpgradeOnly = True will execute VeloOnly ( and Decoding detectors) in the sequence. The last can be useful concerning @cattanem suggestions in Brunel!344 (closed)

Pr/PrMCTools/src/PrTrackConverter.cpp

+// Include files
+
+
+// from Gaudi
+#include <boost/algorithm/string/replace.hpp>
+
+#include "GaudiKernel/IDataManagerSvc.h"
+#include "GaudiKernel/SmartIF.h"
+// from Event
+#include "Event/Track.h"
+// local
+#include "PrTrackConverter.h"
+
+DECLARE_COMPONENT( PrTrackConverter )
+
+//=============================================================================
+// Standard constructor, initializes variables
+//=============================================================================
+  PrTrackConverter::PrTrackConverter( const std::string& name,
+                                          ISvcLocator* pSvcLocator ) :
+    GaudiAlgorithm( name, pSvcLocator )
+{
+  declareProperty( "RootOfContainers",  m_rootOfContainers = "/Event/Rec/Track" );
+  declareProperty( "RootOfOutContainers",  m_rootOfOutContainers = "/Event/Rec/Track/Keyed" );
+  ///Event/Rec/Track/Copy....
+  declareProperty( "SingleContainer",   m_singleContainer  = "" );
+
+}
+
+//=============================================================================
+// Destructor
+//=============================================================================
+PrTrackConverter::~PrTrackConverter() {}
+
+//=============================================================================
+// Initialisation. Check parameters
+//=============================================================================
+StatusCode PrTrackConverter::initialize() {
+
+  // Mandatory initialization of GaudiAlgorithm
+  StatusCode sc = GaudiAlgorithm::initialize();
+  if( sc.isFailure() ) { return sc; }
+
+  if ( "" != m_singleContainer ) {
+    info() << "Processing only the container " << m_singleContainer << endmsg;
+  } else {
+    info() << "Processing all tracks containers in " << m_rootOfContainers << endmsg;
+  }
+
+  return StatusCode::SUCCESS;
+}
+
+//=============================================================================
+// Main execution
+//=============================================================================
+StatusCode PrTrackConverter::execute() {
+
+  std::vector<std::string> trackContainers;
+  if ( "" != m_singleContainer ) {
+    trackContainers.push_back( m_singleContainer );
+  } else {
+    //== Scan the root directory and make a list of containers to process.
+    DataObject* root =  getIfExists<DataObject*>( m_rootOfContainers );
+    if ( NULL == root ) {
+      info()<<"Root-of-Containers directory " <<   m_rootOfContainers << "' does not exist. Skipping." <<endmsg;
+      return StatusCode::SUCCESS;
+    }
+    
+    SmartIF<IDataManagerSvc> mgr( eventSvc() );
+    typedef std::vector<IRegistry*> Leaves;
+    Leaves leaves;
+    StatusCode sc = mgr->objectLeaves( root, leaves );
+    if ( sc ) {
+      for ( Leaves::const_iterator iL = leaves.begin(); leaves.end() != iL; ++iL ) {
+        const std::string& id = (*iL)->identifier();
+        DataObject* tmp(NULL);
+        sc = eventSvc()->findObject( id, tmp );
+        if ( sc && NULL != tmp ) {
+	  trackContainers.push_back( id );
+        }
+      }
+    }
+  }
+  if( msgLevel(MSG::DEBUG)){
+    debug()<<"Amoung of loaded TrackContainers = "<<trackContainers.size()<<endmsg;
+  }
+  for ( std::vector<std::string>::iterator itS = trackContainers.begin();
+        trackContainers.end() != itS; ++itS ) {
+    if( msgLevel(MSG::DEBUG)){
+      debug() << "Containers found, append to list : " << *itS << endmsg ;
+    }
+    // Retrieve the Tracks
+    std::vector<LHCb::Track>* tracks = getIfExists<std::vector<LHCb::Track> > ( *itS );
+    if ( tracks->size() ==0 ) {
+      info()<<"Container "<<*itS<< " is  empty"<<endmsg;
+      continue;
+    }
+    
+    // Loop over the Tracks
+    LHCb::Tracks* tracks_copy = new LHCb::Tracks();
+    std::string track_cont_out = *itS;
+    
+    if( msgLevel(MSG::DEBUG)){
+      debug()<<"Processing track container = "<<(*itS)<<". It contains "<<tracks->size() <<" Tracks" << endmsg;
+    }
+    boost::replace_all( track_cont_out, m_rootOfContainers, m_rootOfOutContainers );
+    if( msgLevel(MSG::DEBUG)){
+      debug()<<"Copied Keyed track container at location "<<track_cont_out<<endmsg;
+    }
+
+    put( tracks_copy , track_cont_out );
+
+    for( auto& original_track  : *tracks ){
+      LHCb::Track* tr = new LHCb::Track;
+      tr->copy( original_track);
+      tracks_copy->insert( tr );
+    } // End loop over Tracks
+  }
+  return StatusCode::SUCCESS;
+}