Update for nessai v0.4.0

I recently released version 0.4.0 of nessai and added some new keyword arguments. This means the bilby interface for nessai needs updating.

I've opted to overhaul how the default kwargs are defined for nessai. This is to simplify things so I don't have to main two sets of up-to-date defaults and should mean less code changes on the bilby side of things in the future.

Instead of defining an exhaustive list within bilby in default_kwargs the code now inspects the modules in nessai to define the set of all possible kwargs and uses their values as the defaults. These values are then updated with any values we want to override in bilby, for example the output or with reviewed settings if nessai were to be reviewed.

To-do

• Check unit tests for nessai