a few actions improvements ideas

[cyrush]

color tables entry: allow, r,g,b,a, position arrays for a more compact way to specify a color table
explore an include: myfile.yaml directive that can pull in extra settings

[cyrush]

@nicolemarsaglia from the discussion this morning, do we have others to add?

[nicolemarsaglia]

Those are what I had written down as well. And an xml-lite reader, but I like the first two options for colors tables better.

I definitely missed a couple before I started taking notes.

[JustinPrivitera]

num_domains is wrong in different places in the ascent info node

[cyrush]

Added #1436 as issue specific to color table args