--User changes

-Remove Hue as a saved parameter, as well as animation parameters associated with it. It's now a GUI-only field that is never saved.
 -Make histogram, density filter buffer, and all associated fields always float, even when using double. In that case, only the iteration calculations are now double. Suggested by Thomas Ludwig.
 -Print all three kernels in EmberRender when the --dump_kernel option is specified.
 -Apply variations filter to randoms.

--Bug fixes
 -Fix bug where hue was not being preserved when switching controllers and embers. Very hard to repro bug, but mostly overcome by eliminating hue as a saved parameter.

--Code changes
 -De-templatized DEOpenCLKernelCreator and FinalAccumOpenCLKernelCreator. They now just take a bool as a parameter to specify double precision.
 -To accommodate the buffers being float, introduce a new #define types in EmberCL called real4_bucket, and real4reals_bucket.
 -Density and spatial filtering structs now use this type.
 -ConvertDensityFilter() and ConvertSpatialFilter() no longer return a value, they just assign to the member.

Source/Fractorium/FractoriumLibrary.cpp

@@ -253,6 +253,8 @@ void Fractorium::OnEmberTreeItemChanged(QTreeWidgetItem* item, int col) { m_Cont
 /// Clears the undo state.
 /// Resets the rendering process.
 /// Called when the user double clicks on a library tree item.
+/// This will get called twice for some reason, and there's no way to prevent it.
+/// Doesn't seem to cause any problems.
 /// </summary>
 /// <param name="item">The item double clicked on</param>
 /// <param name="col">The column clicked, ignored.</param>