[Bf-python] Support listing of multiple versions of the same addon

[Asbjørn]

On 27.02.2013 13:05, CoDEmanX wrote:
> I don't see a sensible way to add multiple addon version support to
> Blender...

Well, concurrently I agree. But if you could have a dropdown in the 
addon browser, so you could switch the active version, that could work. 
It'd then deactivate version X and activate version Y.

Cheers
- Asbjørn