[Simian]
* Fixed a regression with ViewerEffect packet handling
* Added undo and redo support
* Changed ISceneProvider interfaces to be more consistent and avoid duplicate lookups
* Attempting to unify avatar and prim handling by storing agents as both a SimulationObject and an Agent in the scene
* Comment out noisy resend logging and catch broken packets in the resend queue
* Improved the README
* Avoid generating two meshes when a world-transformed mesh is generated (are these even necessary?)
git-svn-id: http://libopenmetaverse.googlecode.com/svn/libopenmetaverse/trunk@2456 52acb1d6-8a22-11de-b505-999d5b087335
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