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…o in the wallet

ef8e2a5 tests: Test that external inputs of txs in wallet is handled correctly (Andrew Chow)
eb87963 wallet: Try estimating input size with external data if wallet fails (Andrew Chow)
a537d7a wallet: SelectExternal actually external inputs (Andrew Chow)
f2d00bf wallet: Add CWallet::IsMine(COutPoint) (Andrew Chow)

Pull request description:

  if a transaction is being funded that has an external input, and that input's parent is also in the wallet, we will fail to detect that and fail to fund the transaction. In order to correctly detect such inputs, we need to be doing `IsMine` on all specified inputs in order to use `Select` and `SelectExternal` correctly. Additionally `SelectCoins` needs to call `CalculateMaximumSignedInputSize` with the correct parameters which depends on whether the wallet is able to solve for the input. Because there are some situations where the wallet could find an external input to belong to it (e.g. watching an address - unable to solve, but will be ISMINE_WATCHONLY), instead of switching which `CalculateMaximumSignedInputSize` to use, we should call the one that uses the wallet, and if that fails, try again with the one that uses external solving data.

  Also adds a test for this case.

ACKs for top commit:
  instagibbs:
    ACK ef8e2a5
  furszy:
    ACK ef8e2a5
  ishaanam:
    reACK ef8e2a5

Tree-SHA512: a43c4aefeed4605f33a36ce87ebb916e2c153fea6d415b02c9a89275e84a7e3bf12840b33c296d2d2bde46350390da48d9262f9567338e3f21d5936aae4caa1e
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Bitcoin Core integration/staging tree

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