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Merge rust-bitcoin/rust-bitcoin#3693: Change `Amount::MAX` from `u64::MAX` to `Amount::MAX_MONEY`

<a class=hub.com/rust-bitcoin/rust-bitcoin/commit/<a class="double-link" href="https://git"><a class=hub.com/rust-bitcoin/rust-bitcoin/commit/6950c0a7b507f9d70c1ebdab540634482f73b247">6950c0a7b Change `Amount::MAX` to equal `MAX_MONEY` (Jamil Lambert, PhD)

Pull request description:

  As discussed in #3688 and #3691 using `u64::MAX` causes errors when converting to `f64` so `MAX_MONEY` is should be used as the maximum `Amount`.

   - `Amount::MAX` changed to equal `MAX_MONEY`
   - Add a check to add, multiply and from_str functions
   - Change tests to account for new lower maximum

  Different approach to the existing PR #3692.  I have only done Amount and not SignedAmount until there is feedback on which approach to use.

ACKs for top commit:
  tcharding:
    ACK 6950c0a7b507f9d70c1ebdab540634482f73b247
  apoelstra:
    ACK 6950c0a7b507f9d70c1ebdab540634482f73b247; successfully ran local tests

Tree-SHA512: 03ebf39c499618fab21ca62cf9cddfb1c92

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