fixed bug in MCMCsuite calculateEfficiency, added drop=FALSE
fixed bug in MCMCsuite calculateEfficiency, added drop=FALSE

nxdao2000/nimble,nimble-dev/nimble,NLMichaud/nimble,nimble-dev/nimble,NLMichaud/nimble,nxdao2000/nimble,nimble-dev/nimble,nimble-dev/nimble,nxdao2000/nimble,nxdao2000/nimble,NLMichaud/nimble,nimble-dev/nimble,NLMichaud/nimble