feature request: for sampling the corners of the parameter space

[shimwell]

Thanks for making this useful package.

I have been using it for a while now to produce nice plots of parameter studies.

One addition I often find myself making is to manually sample all the corner points of the parameter space prior to running the Halton sampling.

I was wondering if it might be possible to a flag for users who want to sample at the corners of the nD dimensional space to avoid partial coverage of the parameter space like this