Need Source Type

[axf295]

Source type should be stored and available as sourcegenerator method;

i.e.

sourcegenerator.source.source_type

should be one of:

"sso", "star", "extragalactic", "unknown"

and maybe we can add sub_type for more info on type ; i.e. which type of star, which type of AGN or transient, etc?

[Sulla2012]

Happy to do this, ideally it would be tied to some flag in the actual database. You can at least tell if it's an sso or fixed source by examining SourceGenerator.source.