* Cleaned up copyright notices in AssemblyInfo.cs's
* Added Copyright headers to a bunch of files missing them
* Replaced several common string instances with a static constant to prevent reallocation of the same strings thousands of times. "" -> String.Empty is the first such candidate.
* Added conceptual TribalMedia.Framework.Data library; this is meant as a generic database layer abstraction library, that should be specialized into OpenSim.Framework.Data
* OpenSim.Framework.Data should subclass FieldMappers to extend LLVector3 and LLQuaternions