Add historical release notes for October 2015 bugfix releases

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+Bitcoin Core version 0.11.1 is now available from:
+
+  <https://bitcoin.org/bin/bitcoin-core-0.11.1/>
+
+This is a new minor version release, bringing security fixes. It is recommended
+to upgrade to this version as soon as possible.
+
+Please report bugs using the issue tracker at github:
+
+  <https://github.com/bitcoin/bitcoin/issues>
+
+Upgrading and downgrading
+=========================
+
+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).
+
+Downgrade warning
+------------------
+
+Because release 0.10.0 and later makes use of headers-first synchronization and
+parallel block download (see further), the block files and databases are not
+backwards-compatible with pre-0.10 versions of Bitcoin Core or other software:
+
+* Blocks will be stored on disk out of order (in the order they are
+received, really), which makes it incompatible with some tools or
+other programs. Reindexing using earlier versions will also not work
+anymore as a result of this.
+
+* The block index database will now hold headers for which no block is
+stored on disk, which earlier versions won't support.
+
+If you want to be able to downgrade smoothly, make a backup of your entire data
+directory. Without this your node will need start syncing (or importing from
+bootstrap.dat) anew afterwards. It is possible that the data from a completely
+synchronised 0.10 node may be usable in older versions as-is, but this is not
+supported and may break as soon as the older version attempts to reindex.
+
+This does not affect wallet forward or backward compatibility. There are no
+known problems when downgrading from 0.11.x to 0.10.x.
+
+Notable changes
+===============
+
+Fix buffer overflow in bundled upnp
+------------------------------------
+
+Bundled miniupnpc was updated to 1.9.20151008. This fixes a buffer overflow in
+the XML parser during initial network discovery.
+
+Details can be found here: http://talosintel.com/reports/TALOS-2015-0035/
+
+This applies to the distributed executables only, not when building from source or
+using distribution provided packages.
+
+Additionally, upnp has been disabled by default. This may result in a lower
+number of reachable nodes on IPv4, however this prevents future libupnpc
+vulnerabilities from being a structural risk to the network
+(see https://github.com/bitcoin/bitcoin/pull/6795).
+
+Test for LowS signatures before relaying
+-----------------------------------------
+
+Make the node require the canonical 'low-s' encoding for ECDSA signatures when
+relaying or mining.  This removes a nuisance malleability vector.
+
+Consensus behavior is unchanged.
+
+If widely deployed this change would eliminate the last remaining known vector
+for nuisance malleability on SIGHASH_ALL P2PKH transactions. On the down-side
+it will block most transactions made by sufficiently out of date software.
+
+Unlike the other avenues to change txids on transactions this
+one was randomly violated by all deployed bitcoin software prior to
+its discovery. So, while other malleability vectors where made
+non-standard as soon as they were discovered, this one has remained
+permitted. Even BIP62 did not propose applying this rule to
+old version transactions, but conforming implementations have become
+much more common since BIP62 was initially written.
+
+Bitcoin Core has produced compatible signatures since a28fb70e in
+September 2013, but this didn't make it into a release until 0.9
+in March 2014; Bitcoinj has done so for a similar span of time.
+Bitcoinjs and electrum have been more recently updated.
+
+This does not replace the need for BIP62 or similar, as miners can
+still cooperate to break transactions.  Nor does it replace the
+need for wallet software to handle malleability sanely[1]. This
+only eliminates the cheap and irritating DOS attack.
+
+[1] On the Malleability of Bitcoin Transactions
+Marcin Andrychowicz, Stefan Dziembowski, Daniel Malinowski, Łukasz Mazurek
+http://fc15.ifca.ai/preproceedings/bitcoin/paper_9.pdf
+
+Minimum relay fee default increase
+-----------------------------------
+
+The default for the `-minrelaytxfee` setting has been increased from `0.00001`
+to `0.00005`.
+
+This is necessitated by the current transaction flooding, causing
+outrageous memory usage on nodes due to the mempool ballooning. This is a
+temporary measure, bridging the time until a dynamic method for determining
+this fee is merged (which will be in 0.12).
+
+(see https://github.com/bitcoin/bitcoin/pull/6793, as well as the 0.11
+release notes, in which this value was suggested)
+
+0.11.1 Change log
+=================
+
+Detailed release notes follow. This overview includes changes that affect
+behavior, not code moves, refactors and string updates. For convenience in locating
+the code changes and accompanying discussion, both the pull request and
+git merge commit are mentioned.
+
+- #6438 `2531438` openssl: avoid config file load/race
+- #6439 `980f820` Updated URL location of netinstall for Debian
+- #6384 `8e5a969` qt: Force TLS1.0+ for SSL connections
+- #6471 `92401c2` Depends: bump to qt 5.5
+- #6224 `93b606a` Be even stricter in processing unrequested blocks
+- #6571 `100ac4e` libbitcoinconsensus: avoid a crash in multi-threaded environments
+- #6545 `649f5d9` Do not store more than 200 timedata samples.
+- #6694 `834e299` [QT] fix thin space word wrap line break issue
+- #6703 `1cd7952` Backport bugfixes to 0.11
+- #6750 `5ed8d0b` Recent rejects backport to v0.11
+- #6769 `71cc9d9` Test LowS in standardness, removes nuisance malleability vector.
+- #6789 `b4ad73f` Update miniupnpc to 1.9.20151008
+- #6785 `b4dc33e` Backport to v0.11: In (strCommand == "tx"), return if AlreadyHave()
+- #6412 `0095b9a` Test whether created sockets are select()able
+- #6795 `4dbcec0` net: Disable upnp by default
+- #6793 `e7bcc4a` Bump minrelaytxfee default
+
+Credits
+=======
+
+Thanks to everyone who directly contributed to this release:
+
+- Adam Weiss
+- Alex Morcos
+- Casey Rodarmor
+- Cory Fields
+- fanquake
+- Gregory Maxwell
+- Jonas Schnelli
+- J Ross Nicoll
+- Luke Dashjr
+- Pavel Janík
+- Pavel Vasin
+- Peter Todd
+- Pieter Wuille
+- randy-waterhouse
+- Ross Nicoll
+- Suhas Daftuar
+- tailsjoin
+- ฿tcDrak
+- Tom Harding
+- Veres Lajos
+- Wladimir J. van der Laan
+
+And those who contributed additional code review and/or security research:
+
+- timothy on IRC for reporting the issue
+- Vulnerability in miniupnp discovered by Aleksandar Nikolic of Cisco Talos
+
+As well as everyone that helped translating on [Transifex](https://www.transifex.com/projects/p/bitcoin/).
+