Add additional plots

[DrPaulSharp]

We have a plotting module that contains a plotting figure class and the plot_ref_sld routine. We want to add the following, adapted from the MATLAB code:

• cornerPlot
• plotHists
• bayesShadedPlot
• histp
• mcmcplot
• shade
• plotBayes (this function simply calls other plotting functions)

[DrPaulSharp]

Note - Bear in mind that some of these plots require Bayesian analysis. To get this data, run either the "NS" or "Dream" minimisers.

[alexhroom]

shade is not required as its function is covered by plt.fill_between