mining: Fix duplicate txns in the prio heap. #1108
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This prevents the ability for duplicate transactions to be added to the mining priority heap when a transaction spends multiple outputs from the same input transaction by converting the dependency tracking to use a map keyed by the transaction hash instead of a linked list.
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This prevents the ability for duplicate transactions to be added to the mining priority heap when a transaction spends multiple outputs from the same input transaction by converting the dependency tracking to use a map keyed by the transaction hash instead of a linked list.
Work towards #709.