doc: Add historical release notes

Add all known release notes for versions since 0.3.12,
thanks to Matt Corallo for collecting them on the wiki.

doc/release-notes/release-notes-0.4.4.md

@@ -0,0 +1,30 @@
+Bitcoin version 0.4.4 is now available for download at:
+http://luke.dashjr.org/programs/bitcoin/files/bitcoind-0.4.4/
+
+This is a bugfix-only release based on 0.4.0.
+
+Please note that the wxBitcoin GUI client is no longer maintained nor supported. If someone would like to step up to maintain this, they should contact Luke-Jr.
+
+Please report bugs for the daemon only using the issue tracker at github:
+https://github.com/bitcoin/bitcoin/issues
+
+Stable source code is hosted at Gitorious:
+http://gitorious.org/bitcoin/bitcoind-stable/archive-tarball/v0.4.4#.tar.gz
+
+BUG FIXES
+
+Limit the number of orphan transactions stored in memory, to prevent a potential denial-of-service attack by flooding orphan transactions. Also never store invalid transactions at all.
+Fix possible buffer overflow on systems with very long application data paths. This is not exploitable.
+Resolved multiple bugs preventing long-term unlocking of encrypted wallets (issue #922).
+Only send local IP in "version" messages if it is globally routable (ie, not private), and try to get such an IP from UPnP if applicable.
+Reannounce UPnP port forwards every 20 minutes, to workaround routers expiring old entries, and allow the -upnp option to override any stored setting.
+Various memory leaks and potential null pointer deferences have been
+fixed.
+Several shutdown issues have been fixed.
+Check that keys stored in the wallet are valid at startup, and if not,
+report corruption.
+Various build fixes.
+If no password is specified to bitcoind, recommend a secure password.
+Update hard-coded fallback seed nodes, choosing recent ones with long uptime and versions at least 0.4.0.
+Add checkpoint at block 168,000.
+