compilation stuff
SumKernels' arguments are the multiplying constants for each associated kernel
New ending option for dumper; GP prediction output

The dumper routine knows when it is being called for the last time (on convergence
or maxIter reached). It now outputs GP predictions to a new file, if the GP is the
model being used. The MAP values of the GP hyperparameters are used for the
prediction.
debug things in like
sdim is set by the context; first stage of setting hyperpars priors
options for nest command: user sets namelist and possibility to set how many cpus to use
reads new GP prediction file (when this is the model) and plots predictions
priors for hyperpars (crude); dumper only outputs with GP model
crude (re)setting of hyperpars to calculate lnlikelihood
testing hyperpars prior limits
fix python-side calculations/outputs for GP model