add setters to egamma objects to allow relinking to reduced collections for mini aod
add ReducedEGProducer for creating reduced collections of electrons and photons with consistently relinked clusters and conversions
adapt mini aod configs to use reducedEgamma collections
add function to clear detid vector for supercluster slimming in miniaod
restore slimming of internal electron and photon variables
add additional flexibility in relinking and restore previous mini aod behaviour of keeping supercluster and seed cluster for all output electrons and photons
Adapt ConversionTools to mini aod (work with embedded tracks and add loose matching for reduced conversion collection)