sensmodel() names

[thomased]

Minor annoyance — currently the names of df's returned by sensmodel() default to the lambda max's, which results in a warning about column names if you feed it right into vismodel(). That necessitates the extra step of renaming to avoid the warning.

We could either (?):

• (1) Add a names argument of some kind so that you can name the columns whatever you like when calling sensmodel()
• (2) Make the defaults vismodel-friendly, at least up to tetrachromats. Beyond tetrachromats you could just leave it as-is I guess.

I'd lean toward (1), but open to anything.

[Bisaloo]

Just a thought, not sure about possible negative consequences: if the issue is just the warning, we could leverage the (currently unused) fact that sensmodel() objects have a special class and just bypass the warning in this case.

[thomased]

A quick idea re: option (1) - 8ff03b0

I like the class idea too though — I'll have a look.