kaileyrumbo/jak — pull request #1 by reedacartwright (2012-11-14 05:13:01+00:00)
Title: Simplifed algorithm

We can simplify the algorithm for what happens to the tree across populations if we store a negative branch length in the uncoalesced trees. Ancestral populations will see the negative number as "time before zero generation". No special bookkeeping should then be needed.