Get rid of separate ReconstructedParticleRelations for simplicity

eic_data.yaml

@@ -296,12 +296,6 @@ datatypes:
       - float             momentum          // particle 3-momentum magnitude [GeV]
       - float             energy            // Particle energy, consistent with PID assigment [GeV]
       - float             mass              // The mass of the particle in [GeV]
-
-  eic::ReconstructedParticleRelations:
-    Description: "Relational info associated with our reconstructed particle"
-    Author: "S. Joosten"
-    Members:
-      - eic::Index        recID             // ReconstructedParticle index
       - eic::Index        vertexID          // Start vertex for this particle
       - eic::Index        trackID           // Index of the associated track, if any
       - eic::Index        ecalID            // Index of associated pos/barrel/neg ECAL cluster, if any