Actually, it looks like I already thought that this version wasn't terribly clear.  The other two versions had "This would typically be smaller than maxk_threshold." which is probably clear enough, right?  I guess I just neglected to change this one.

But it would probably make sense to at least excise the complete list from the GSObject docstring and tell users to type `help(galsim.GSParams)` for a complete list of parameters.  That at least gets rid of one duplication.  The version in include/galsim/SBProfile is probably fine to keep, and it doesn't actually have to be kept strictly in sync with the other one, since it is more for developers while the other one is more for users.