Mv btc release notes to doc/bitcoin-release-notes

doc/bitcoin-release-notes/release-notes-0.5.1.md

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+Bitcoin version 0.5.1 is now available for download at:
+http://sourceforge.net/projects/bitcoin/files/Bitcoin/bitcoin-0.5.1/
+
+This is a bugfix-only release.
+
+This release includes 13 translations, including 5 new translations:
+Italian, Hungarian, Ukranian, Portuguese (Brazilian) and Simplified Chinese.
+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
+
+Project source code is hosted at github; we are no longer
+distributing .tar.gz files here, you can get them
+directly from github:
+https://github.com/bitcoin/bitcoin/tarball/v0.5.1  # .tar.gz
+https://github.com/bitcoin/bitcoin/zipball/v0.5.1  # .zip
+
+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.
+
+
+BUG FIXES
+
+Re-enable SSL support for the JSON-RPC interface (it was unintentionally
+disabled for the 0.5.0 release binaries).
+
+The code that finds peers via "dns seeds" no longer stops bitcoin startup
+if one of the dns seed machines is down.
+
+Tooltips on the transaction list view were rendering incorrectly (as black boxes
+or with a transparent background).
+
+Prevent a denial-of-service attack involving flooding a bitcoin node with
+orphan blocks.
+
+The wallet passphrase dialog now warns you if the caps lock key was pressed.
+
+Improved searching in addresses and labels in bitcoin-qt.