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-0.7.2.md

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+Bitcoin version 0.7.2 is now available from:
+  http://sourceforge.net/projects/bitcoin/files/Bitcoin/bitcoin-0.7.2
+
+This is a bug-fix minor release.
+
+Please report bugs using the issue tracker at github:
+  https://github.com/bitcoin/bitcoin/issues
+
+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).
+
+If you were running on Linux with a version that might have been compiled
+with a different version of Berkeley DB (for example, if you were using an
+Ubuntu PPA version), then run the old version again with the -detachdb
+argument and shut it down; if you do not, then the new version will not
+be able to read the database files and will exit with an error.
+
+Explanation of -detachdb (and the new "stop true" RPC command):
+The Berkeley DB database library stores data in both ".dat" and
+"log" files, so the database is always in a consistent state,
+even in case of power failure or other sudden shutdown. The
+format of the ".dat" files is portable between different
+versions of Berkeley DB, but the "log" files are not-- even minor
+version differences may have incompatible "log" files. The
+-detachdb option moves any pending changes from the "log" files
+to the "blkindex.dat" file for maximum compatibility, but makes
+shutdown much slower. Note that the "wallet.dat" file is always
+detached, and versions prior to 0.6.0 detached all databases
+at shutdown.
+
+Bug fixes
+---------
+
+* Prevent RPC 'move' from deadlocking. This was caused by trying to lock the
+  database twice.
+
+* Fix use-after-free problems in initialization and shutdown, the latter of
+  which caused Bitcoin-Qt to crash on Windows when exiting.
+
+* Correct library linking so building on Windows natively works.
+
+* Avoid a race condition and out-of-bounds read in block creation/mining code.
+
+* Improve platform compatibility quirks, including fix for 100% CPU utilization
+  on FreeBSD 9.
+
+* A few minor corrections to error handling, and updated translations.
+
+* OSX 10.5 supported again
+
+----------------------------------------------------
+Thanks to everybody who contributed to this release:
+
+Alex
+dansmith
+Gavin Andresen
+Gregory Maxwell
+Jeff Garzik
+Luke Dashjr
+Philip Kaufmann
+Pieter Wuille
+Wladimir J. van der Laan
+grimd34th