merged (hard) the util from devel
adding gpy_congif from devel
removed shapefile dep.
adding back param_to_array
removed sinc
made svigp depend on GP instead of gp_base
removed fitc_classification modle
added PCA to linalg
removed some X_normalising things
basic GP regression now working again
exact gaussian inference now accepts a kern and X, not K
tidying in kern.py
beginnings of neat gradient framework