+* MIGRATION [CG]
+ - on-demand encoding => move logic to block-library!?
+ - peer selection => how to consider latency/bw/etc?
+ - content transmission => how often the same block?
+ - how to select delay before next migration?
+ - migration to us
+ - testing
+ - integrate with FS or not? (peer list, index/on-demand encoding, block code,
+ inbound priority assignment; all would be easier with tight integration!)