Define roadmap for future releases

[MBravoS]

Basically what the title says, we should think about what are the next steps for splotch. For the moment I've set a milestone for v0.7.0, but what should come after that it's less obvious to me. Do we have more functionality that we would like to add for more v0.x or are we just documentation/CI away from v1.0?

[MBravoS]

Ok, I have one idea for a new feature. It would be neat to have the option to have contour and countourp also show data points outside the contours (outliers). As always, I found one implementation of this in stackoverflow. I have already tested separately and it works fine, so it should be easy to add.

[AstroRobin]

That's a neat idea, I've seen that in many papers and I suppose it's just a call to contour and then a call to scatter. We just need to think about firstly how we parse keywords to the scatter function (we could use scatter_kw as we do in cornerplot()) and secondly what will be returned to the user: a list with the contour lines and the scatter collection?