Redesign Conary Backend

the actual version of packagekit its PACKAGEKIT_0_6_0 and the backend its a big [spaghetti|http://es.wikipedia.org/wiki/Espagueti] (i think alfredo because im loved!)

The conary backend need redesign and document.

h3. Package its a Object
* Package Contains 3 layer
** Conary Layer
(trove, repo, flavor)
** XMLCache layer
( metadata )
** PackageKitInfo Layer
( installed info, )

For make a valid package with a query you can make a valid package.

{code}
class Package:
# conary layer
self.trove = ('name', VFS("version"), Flavor("#xxx")),
# XMLCache Layer
self.metadata = dict(
name= self._name
label = self._label,
version = self._version,
shortDesc = self._shortDesc
longDesc = self._longDesc
url = self._url ,
category = [ i for i in self._categories ],
licenses = [ i for i in self._licences ],
),
# PackageKit Layer
self.installed = True