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Added flowchart for VR track jet reconstruction in ModuleOverview.md and switched from TrackVertexAssociationTool to JetTrackVtxAssoAlg for track to vertex association while reconstructing PV0Tracks

Merged Roshan Joshi requested to merge rjoshi/athena:HLTMenuConfig-VRTrackJetReco-flowchart into master
  1. A flowchart that describes the reconstruction of variable radius (VR) track jets at trigger level has been added to the ModuleOverview.md file for the purpose of documentation. The rendering is such that there is large space at the top and bottom of the flowchart. The only way to remove the space that I could find was to not allow the flowchart to take maximum width. However, that results in cutoff of portion of the flowchart.
  2. In reconstructing the primary vertex tracks (PV0Tracks) at the trigger level, track to vertex association is needed. In this MR this has been done using JetTrackVtxAssoAlg so that we get the algorithm directly. Additionally, the addDecoAlg option to the track to vertex association has been set to false because when set to true it causes the reconstruction to fail. The option has been set to False in JetInputConfig as well.
  3. The PV0Tracks are now built using the JetSelectedTracks_ftf (standard tracks). Previously a new track container was built, which was then used to build PV0Tracks.
Edited by Roshan Joshi