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-0.3.24.md

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+Bitcoin v0.3.24 is now available for download at
+https://sourceforge.net/projects/bitcoin/files/Bitcoin/bitcoin-0.3.24/
+
+This is another bug fix release.  We had hoped to have wallet encryption ready for release, but more urgent fixes for existing clients were needed -- most notably block download problems were getting severe.  Wallet encryption is ready for testing at https://github.com/bitcoin/bitcoin/pull/352 for the git-savvy, and hopefully will follow shortly in the next release, v0.4.
+
+Notable fixes in v0.3.24, and the main reasons for this release:
+
+F1) Block downloads were failing or taking unreasonable amounts of time to complete, because the increased size of the block chain was bumping up against some earlier buffer-size DoS limits.
+
+F2) Fix crash caused by loss/lack of network connection.
+
+Notable changes in v0.3.24:
+
+C1) DNS seeding enabled by default.
+
+C2) UPNP enabled by default in the GUI client.  The percentage of bitcoin clients that accept incoming connections is quite small, and that is a problem.  This should help.  bitcoind, and unofficial builds, are unchanged (though we encourage use of "-upnp" to help the network!)
+
+C3) Initial unit testing framework.  Bitcoin sorely needs automated tests, and this is a beginning.  Contributions welcome.
+
+C4) Internal wallet code cleanup.  While invisible to an end user, this change provides the basis for v0.4's wallet encryption.