Code cleanups utilising new interfaces for parameter tying and kernel parameters.
Code cleanups utilising new interfaces for parameter tying and kernel
parameters.

TianpeiLuke/GPmat,TianpeiLuke/GPmat,TianpeiLuke/GPmat,SheffieldML/GPmat,TianpeiLuke/GPmat,TianpeiLuke/GPmat,SheffieldML/GPmat,TianpeiLuke/GPmat,SheffieldML/GPmat,SheffieldML/GPmat,SheffieldML/GPmat,SheffieldML/GPmat