bugfix. Gradients of parameters with bounded constraints now work properly in the kernel class
bugfix. Gradients of parameters with bounded constraints now work properly in the kernel class

SheffieldML/forkedGPmat,SheffieldML/forkedGPmat,SheffieldML/forkedGPmat,SheffieldML/forkedGPmat,SheffieldML/forkedGPmat,SheffieldML/forkedGPmat