[packagekit] Replace groups with tags

[Richard Hughes]

On Wed, 2007-10-31 at 00:04 +0100, Ali Sabil wrote:
> Yes, currently this is possible for search-group, but not for
> get-description. Maybe get-description should allow attaching 1
> primary Group, and then a set of secondary groups ? Or even better
> have a priority attached to each Group the package belongs to ?

What's wrong with returning either just the primary group, or all the
group enums delimited by ";"? If we do the latter, we'll need to note
this in the docs.

Richard.