AthContainers+AthenaPoolCnvSvc+xAODTrigger: Use ThinningInfo.
Change copyThinned, etc to take a ThinningInfo instead of a ThinningDecisionBase. Use variable selection information from it. Update calls to them.
Change copyThinned, etc to take a ThinningInfo instead of a ThinningDecisionBase. Use variable selection information from it. Update calls to them.