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Merge rust-bitcoin/rust-bitcoin#2604: Enforce displaying Amount with trailing zeros

<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/d887423efcdad8db4c60ffe61f53d2356c82c87c">d887423ef Enforce displaying Amount with trailing zeros (448 OG)

Pull request description:

  It is common to display bitcoins using trailing zeros upto 8 decimals. This commit enforces:
  - Displaying Amount in BTC with trailing zeroes by eight decimal places if a precision on the Amount is not specified.
  - Displaying Amount in BTC upto the precision specified truncating the insignificant zeros.
  - Displaying amount in BTC without any decimals if the remainder of the amount divided by the satoshis in 1 BTC is equal to zero using formula `satoshis.rem_euclid(Amount::ONE_BTC.to_sat()) != 0`

  These are not breaking changes and all previous tests pass.

  A testcase is added to for changes introduced.

  Resolves: #2136

ACKs for top commit:
  sanket1729:
    ACK d887423efcdad8db4c60ffe61f53d2356c82c87c
  apoelstra:
    ACK d887423efcdad8db4c60ffe61f53d2356c82c87c

Tree-SHA512: c32e41216c7e16974308c04ce65e9d522bc

37 of 37 new or added lines in 1 file covered. (100.0%)

19732 of 23511 relevant lines covered (83.93%)

16449.48 hits per line