Few fixes to allow old distributions of R (<2.11.0) run the GP toolbox without installing TIGRE.
Few fixes to allow old distributions of R (<2.11.0) run the GP toolbox without installing TIGRE.

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