Disallow "mixed" inputs of an obsid + kwargs that uses mica.starcheck database

[taldcroft]

From #256 (comment)

Change the API to disallow the "mixed" inputs case. Basically you can only get the mica.starcheck backend if only obsid is provided. If any other args are provided then it doesn't go that route. That makes it slightly harder in our development end but is then quite safe. I can make a helper function that does what the current code would have done for a mixed "obsid + other kwargs" case, to make it easy to get the necessary kwargs for a subsequent call of get_aca_catalog(**kwargs).

Aiming for 4.4, but at a lower priority than other issues. This might break some notebooks or code.

[taldcroft]

This is a fine idea but since it may break some things, I'm pushing this off the 4.4 release.