it's a mess but it doesn't crash... yet
allow initial reservoir to be smaller than streaming reservoir
remove excessive printlns
update runlda comments, leave params rather arbitrary
clean up token count, vocab in pflda
remove unused AssignmentStore.newDocument
simplify assignment store, we do not need to account for active inner nodes
implement assignment store prune (not yet merge)
implement merge
note about docidx
restore initialBatchSize for sim-3
quick and dirty doclabels implementation