RunSampler: Print initial likelihood
CitInfNoTopics: Add cited item counts
Gibbs: Split out concurrent gibbs sampler
Kill BayesStack.Core namespace
network-topic-models: Fix BayesStack.Core references
Gibbs: Add simple gibbs sampler
Gibbs.Simple: Fix module declaration
CitInfNoTopics: Cache cited and citing node sets
CitInfNoTopics: Rework initialization
CitInfNoTopics: Cleanup initialization
CitInf: Make initialization more efficient

I must have been on crack when I wrote this code the first time
Gibbs.Concurrent: Kill print from debugging
CitInf: Strictify update units
CitInfNoTopics: Lensify
CitInfNoTopics: Use lensy notation
CitInf: Doh, Data.Map's Monoid strikes again
CitInfNoTopics: Data.Map's Monoid is unfortunate
CitInf: Make Arc its own datatype
CitInfNoTopics: Make Arc its own datatype
CitInfNoTopics: Lensify likelihood