Neil Booth 93bb09230c Track tx size directly; calculate fees from that ...

This has several advantages.  Fee calculation is now very fast,
as we don't need to keep reserializing the tx.  Another is that
we can reason about the fees after adding a change output without
having to add it, recalculate the tx fee, and remove it again.

2015-11-29 15:40:11 +09:00

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