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.

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+Bitcoin version 0.5.0 is now available for download at:
+http://sourceforge.net/projects/bitcoin/files/Bitcoin/bitcoin-0.5.0/
+
+The major change for this release is a completely new graphical interface that uses the Qt user interface toolkit.
+
+This release include German, Spanish, Spanish-Castilian, Norwegian and Dutch translations. More translations are welcome; join the project at Transifex if you can help:
+https://www.transifex.net/projects/p/bitcoin/
+
+Please report bugs using the issue tracker at github:
+https://github.com/bitcoin/bitcoin/issues
+
+For Ubuntu users, there is a new ppa maintained by Matt Corallo which you can add to your system so that it will automatically keep bitcoin up-to-date.  Just type "sudo apt-add-repository ppa:bitcoin/bitcoin" in your terminal, then install the bitcoin-qt package.
+
+MAJOR BUG FIX  (CVE-2011-4447)
+
+The wallet encryption feature introduced in Bitcoin version 0.4.0 did not sufficiently secure the private keys. An attacker who
+managed to get a copy of your encrypted wallet.dat file might be able to recover some or all of the unencrypted keys and steal the
+associated coins.
+
+If you have a previously encrypted wallet.dat, the first time you run bitcoin-qt or bitcoind the wallet will be rewritten, Bitcoin will
+shut down, and you will be prompted to restart it to run with the new, properly encrypted file.
+
+If you had a previously encrypted wallet.dat that might have been copied or stolen (for example, you backed it up to a public
+location) you should send all of your bitcoins to yourself using a new bitcoin address and stop using any previously generated addresses.
+
+Wallets encrypted with this version of Bitcoin are written properly.
+
+Technical note: the encrypted wallet's 'keypool' will be regenerated the first time you request a new bitcoin address; to be certain that the
+new private keys are properly backed up you should:
+
+1. Run Bitcoin and let it rewrite the wallet.dat file
+
+2. Run it again, then ask it for a new bitcoin address.
+Bitcoin-Qt: Address Book, then New Address...
+bitcoind: run the 'walletpassphrase' RPC command to unlock the wallet,  then run the 'getnewaddress' RPC command.
+
+3. If your encrypted wallet.dat may have been copied or stolen, send  all of your bitcoins to the new bitcoin address.
+
+4. Shut down Bitcoin, then backup the wallet.dat file.
+IMPORTANT: be sure to request a new bitcoin address before backing up, so that the 'keypool' is regenerated and backed up.
+
+"Security in depth" is always a good idea, so choosing a secure location for the backup and/or encrypting the backup before uploading it is recommended. And as in previous releases, if your machine is infected by malware there are several ways an attacker might steal your bitcoins.
+
+Thanks to Alan Reiner (etotheipi) for finding and reporting this bug.
+
+MAJOR GUI CHANGES
+
+"Splash" graphics at startup that show address/wallet/blockchain loading progress.
+
+"Synchronizing with network" progress bar to show block-chain download progress.
+
+Icons at the bottom of the window that show how well connected you are to the network, with tooltips to display details.
+
+Drag and drop support for bitcoin: URIs on web pages.
+
+Export transactions as a .csv file.
+
+Many other GUI improvements, large and small.
+
+RPC CHANGES
+
+getmemorypool : new RPC command, provides everything needed to construct a block with a custom generation transaction and submit a solution
+
+listsinceblock : new RPC command, list transactions since given block
+
+signmessage/verifymessage : new RPC commands to sign a message with one of your private keys or verify that a message signed by the private key associated with a bitcoin address.
+
+GENERAL CHANGES
+
+Faster initial block download.