* 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.
namespace to mirror what is done with MySQL. This will require a
configuration change for people using SQLite for prims which is given
as an example in OpenSim.ini.example