9db6234ea9 Show compressed public key in Debug for CompressedPublicKey (Jiri Jakes)
Pull request description:
Currently `CompressedPublicKey` debug produces output of form:
```
CompressedPublicKey(PublicKey(2f8b18dc0adcb73d75f7934d9523ea7347083e41c48115398cb37e295a0a6ffe86e0bf8b1ef65888c880c8d8813a30e69e466380cbe2daec18f3ed1e7a553ff2))
```
Although it shows real internal structure together with inner uncompressed public key, it is not too helpful for the purpose of debugging _compressed_ public key.
After this patch, `Debug` output will be equal to `Display` (it, in fact, delegates rendering to `Display`), prepended by the name of the struct:
```
CompressedPublicKey(02fe6f0a5a297eb38c391581c4413e084773ea23954d93f7753db7dc0adc188b2f)
```
ACKs for top commit:
Kixunil:
ACK 9db6234ea9 unless other maintainers agree to drop the struct name.
apoelstra:
ACK 9db6234ea9 successfully ran local tests; we should keep the struct name since it is canonical for Debug output
Tree-SHA512: e2626678a4144357d3ff4ddd888459ae1283ea50bc7c8ef86deb9902d7d543de79109ac42883e5538f7e2f6a29426224bb43eb44a34f366821e47a9aca563753