[sldev] Source release for 1.18.0.0

[Nicholaz Beresford]

I've seen a lot of changes in the message system (llmessage) and found
this in the release notes:

+Release Notes for Second Life 1.18.0(0) June 14, 2007
+=====================================
+Changes:
+* Message system changes to support transport via TCP (HTTP) as well as UDP.
+** More details are available here: http://blog.secondlife.com/2006/12/21/a-big-change-youll-barely-notice/
+
  Release Notes for Second Life 1.17.0(12) June 13, 2007
  =====================================
  Changes:





Second Life from the inside out:
http://nicholaz-beresford.blogspot.com/