Update plot corner (additional changes)

[annalena-k]

Upon discussion with Stephen, I changed how the truth values and truth color are passed to result.plot_corner() and plot_corner_multi().

The reasoning behind this is the following:

• truth_color is included in the **kwargs and the description is removed since it is exactly a corner kwarg and does not get modified.
• truths is passed as a kwarg to plot_corner_multi(). There, truths needs to be a list with the values in exactly the same order as the values within samples. However, this order is specified within result.plot_corner() by the order of the parameter list. Therefore, we need to pass the truth values as a dictionary to result.plot_corner() and extract the order of parameters by replicating the order of theta.columns. The resulting list is added to kwargs and passed on to plot_corner_multi().

I am not entirely sure whether this is the best way of handling the problem since it might be confusing why truth_color is handled as a kwarg in result.plot_corner() while truths is an explicit argument.

We can discuss this within this PR.

[annalena-k]

I checked the functionality again, it works as intended:

• If you don't specify anything, result.plot_corner includes the non-fixed parameters as well as log_prob, log_prior, weights, etc.
• If you specify parameters=["chirp_mass", "mass_ratio"], you only get the 2D corner plot.