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Coin selection
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### Reuse Avoidance
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A new wallet flag `avoid_reuse` has been added (default off). When enabled,
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a wallet will distinguish between used and unused addresses, and default to not
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use the former in coin selection.
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Rescanning the blockchain is required, to correctly mark previously
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used destinations.
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Together with "avoid partial spends" (present as of Bitcoin v0.17), this
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addresses a serious privacy issue where a malicious user can track spends by
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peppering a previously paid to address with near-dust outputs, which would then
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be inadvertently included in future payments.
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New RPCs
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--------
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- A new `setwalletflag` RPC sets/unsets flags for an existing wallet.
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Updated RPCs
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------------
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Several RPCs have been updated to include an "avoid_reuse" flag, used to control
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whether already used addresses should be left out or included in the operation.
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These include:
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- createwallet
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- getbalance
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- getbalances
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- sendtoaddress
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In addition, `sendtoaddress` has been changed to avoid partial spends when `avoid_reuse`
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is enabled (if not already enabled via the `-avoidpartialspends` command line flag),
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as it would otherwise risk using up the "wrong" UTXO for an address reuse case.
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The listunspent RPC has also been updated to now include a "reused" bool, for nodes
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with "avoid_reuse" enabled.
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