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

[Asbjørn]

On 01.03.2013 19:37, Nathan Vegdahl wrote:
> I realize there are nay-sayers here who for some reason think this is
> a bad idea, but there really are meaningful use cases for this, many
> of which have already been outlined in this thread by myself, Clemens
> Barth, and Domino Marama.  This is a feature that is transparent and
> will not hurt you if you don't use it, but does hurt you if you need
> it and don't have it.

As an add-on developer I would find great use for such a functionality, 
and I think our users could as well. It would be very nice to be able to 
install both the unstable and the stable version, and be able to 
effortlessly switch between them, for example to determine if an issue 
is a regression.

> Clearly the back-end mechanics to make this work are going to be a
> little trickier, however.  For one thing, at the bare minimum
> different versions of the same addon need to be installed in different
> places or with different names or something.  So some kind of standard
> for that will be needed.

I think it would be best if the plugin has to announce (fex in the 
script info block) that it supports "switching" versions. This would 
avoid issues with weirdo scripts.

Cheers
- Asbjørn