annotate: deal with merges
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annotate: deal with merges
This rewrite of the annotate code deals with merges:
- - find all ancestors
- - sort ancestors topologically
- - for each ancestor, pairwise annotate with parents
- - keep a cache of annotations for efficiency
manifest hash: b960d9b9c6a7f6ba351c97675b00a1dd3004dcf1
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