--User changes

-Add Simon Detheridge's name to the About Box.

--Bug fixes
 -Fix bug in OpenCL atomic string, which is never used.
 -Wrong hist and accum allocation size in RendererCL when using float-only buffers now.
 -Move some kernel initialization to a place where it's done once per render, rather than on every interactive iter chunk.

--Code changes
 -Make ConvertCarToRas() just assign to the member rather than return a struct.
 -Make kernel string accessor functions in IterOpenCLKernelCreator, FinalAccumOpenCLKernelCreator and DEOpenCLKernelCreator be const and return a const string reference.
 -Don't include atomic string unless locking on the GPU, which is never.

Source/EmberCL/EmberCLStructs.h

@@ -39,7 +39,7 @@ static string ConstantDefinesString(bool doublePrecision)
 		   << "#endif\n"
 		   << "#pragma OPENCL EXTENSION cl_khr_int64_base_atomics : enable\n"//Only supported on nVidia.
 		   << "typedef long intPrec;\n"
-		   << "typedef ulong atomi;\n"
+		   << "typedef uint atomi;\n"//Same size as real_bucket_t, always 4 bytes.
 		   << "typedef double real_t;\n"
 		   << "typedef float real_bucket_t;\n"//Assume buckets are always float, even though iter calcs are in double.
 		   << "typedef double4 real4;\n"