Merge #16574: doc: Add historical release notes for 0.18.1

61c5c64b317371bfabb696e4a3ece2c9472c27a0 doc: Add historical release notes for 0.18.1 (Wladimir J. van der Laan)

Pull request description:

ACKs for top commit:
  fanquake:
    ACK 61c5c64b317371bfabb696e4a3ece2c9472c27a0

Tree-SHA512: d98011ee79ae9fb69bd4c0d408b87fd05c640e35683b44bacbb49dbc7e66ebb754f46edd268af611b3fd1c171c2a723d516a21099bd6fd015491f0f4119ca33e

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+Bitcoin Core version 0.18.1 is now available from:
+
+  <https://bitcoincore.org/bin/bitcoin-core-0.18.1/>
+
+This is a new minor version release, including new features, various bug
+fixes and performance improvements, as well as updated translations.
+
+Please report bugs using the issue tracker at GitHub:
+
+  <https://github.com/bitcoin/bitcoin/issues>
+
+To receive security and update notifications, please subscribe to:
+
+  <https://bitcoincore.org/en/list/announcements/join/>
+
+How to Upgrade
+==============
+
+If you are running an older version, shut it down. Wait until it has
+completely shut down (which might take a few minutes for older
+versions), then run the installer (on Windows) or just copy over
+`/Applications/Bitcoin-Qt` (on Mac) or `bitcoind`/`bitcoin-qt` (on
+Linux).
+
+The first time you run version 0.15.0 or newer, your chainstate database
+will be converted to a new format, which will take anywhere from a few
+minutes to half an hour, depending on the speed of your machine.
+
+Note that the block database format also changed in version 0.8.0 and
+there is no automatic upgrade code from before version 0.8 to version
+0.15.0 or later. Upgrading directly from 0.7.x and earlier without
+redownloading the blockchain is not supported.  However, as usual, old
+wallet versions are still supported.
+
+Compatibility
+==============
+
+Bitcoin Core is supported and extensively tested on operating systems
+using the Linux kernel, macOS 10.10+, and Windows 7 and newer. It is not
+recommended to use Bitcoin Core on unsupported systems.
+
+Bitcoin Core should also work on most other Unix-like systems but is not
+as frequently tested on them.
+
+From 0.17.0 onwards, macOS <10.10 is no longer supported. 0.17.0 is
+built using Qt 5.9.x, which doesn't support versions of macOS older than
+10.10. Additionally, Bitcoin Core does not yet change appearance when
+macOS "dark mode" is activated.
+
+Known issues
+============
+
+Wallet GUI
+----------
+
+For advanced users who have both (1) enabled coin control features, and
+(2) are using multiple wallets loaded at the same time: The coin control
+input selection dialog can erroneously retain wrong-wallet state when
+switching wallets using the dropdown menu. For now, it is recommended
+not to use coin control features with multiple wallets loaded.
+
+0.18.1 change log
+=================
+
+### P2P protocol and network code
+- #15990 Add tests and documentation for blocksonly (MarcoFalke)
+- #16021 Avoid logging transaction decode errors to stderr (MarcoFalke)
+- #16405 fix: tor: Call `event_base_loopbreak` from the event's callback (promag)
+- #16412 Make poll in InterruptibleRecv only filter for POLLIN events (tecnovert)
+
+### Wallet
+- #15913 Add -ignorepartialspends to list of ignored wallet options (luke-jr)
+
+### RPC and other APIs
+- #15991 Bugfix: fix pruneblockchain returned prune height (jonasschnelli)
+- #15899 Document iswitness flag and fix bug in converttopsbt (MarcoFalke)
+- #16026 Ensure that uncompressed public keys in a multisig always returns a legacy address (achow101)
+- #14039 Disallow extended encoding for non-witness transactions (sipa)
+- #16210 add 2nd arg to signrawtransactionwithkey examples (dooglus)
+- #16250 signrawtransactionwithkey: report error when missing redeemScript/witnessScript (ajtowns)
+
+### GUI
+- #16044 fix the bug of OPEN CONFIGURATION FILE on Mac (shannon1916)
+- #15957 Show "No wallets available" in open menu instead of nothing (meshcollider)
+- #16118 Enable open wallet menu on setWalletController (promag)
+- #16135 Set progressDialog to nullptr (promag)
+- #16231 Fix open wallet menu initialization order (promag) 
+- #16254 Set `AA_EnableHighDpiScaling` attribute early (hebasto) 
+- #16122 Enable console line edit on setClientModel (promag) 
+- #16348 Assert QMetaObject::invokeMethod result (promag)
+
+### Build system
+- #15985 Add test for GCC bug 90348 (sipa)
+- #15947 Install bitcoin-wallet manpage (domob1812)
+- #15983 build with -fstack-reuse=none (MarcoFalke)
+
+### Tests and QA
+- #15826 Pure python EC (sipa)
+- #15893 Add test for superfluous witness record in deserialization (instagibbs)
+- #14818 Bugfix: test/functional/rpc_psbt: Remove check for specific error message that depends on uncertain assumptions (luke-jr)
+- #15831 Add test that addmultisigaddress fails for watchonly addresses (MarcoFalke)
+
+### Documentation
+- #15890 Remove text about txes always relayed from -whitelist (harding)
+
+### Miscellaneous
+- #16095 Catch by reference not value in wallettool (kristapsk)
+- #16205 Replace fprintf with tfm::format (MarcoFalke)
+
+Credits
+=======
+
+Thanks to everyone who directly contributed to this release:
+
+- Andrew Chow
+- Anthony Towns
+- Chris Moore
+- Daniel Kraft
+- David A. Harding
+- fanquake
+- Gregory Sanders
+- Hennadii Stepanov
+- John Newbery
+- Jonas Schnelli
+- João Barbosa
+- Kristaps Kaupe
+- Luke Dashjr
+- MarcoFalke
+- MeshCollider
+- Pieter Wuille
+- shannon1916
+- tecnovert
+- Wladimir J. van der Laan
+
+As well as everyone that helped translating on [Transifex](https://www.transifex.com/projects/p/bitcoin/).