[packagekit] Moved PackageKitBaseBackend in the packagekit python module

[Tim Lauridsen]

I have make so changes to the packagekit python module so the backend 
python classes used by
yum & conary helpers, is located in the module.
I have moved the module from python/ to python/packagekit/ and added 
some links to the yum & conary helpers dir, so the
python helpers can run from the helpers/ dir.
I have fixed the Makefile and the yumBackend.py & yumConary.py, so 
everything is working (I Hope :) )
I somebody could check if the rpms looks sane and the file is located in 
the right places.

Tim

commit 3ec379272d04305afe45ffa3bbd3c98ceed79437
Author: Tim Lauridsen <tla at rasmil.dk>
Date:   Tue Sep 25 09:32:29 2007 +0200

    * Moved python/__init__.py python/packagekit/__init__.py
    
    * Moved backends/yum/helpers/packagekit.py -> 
python/packagekit/backend.py
    So that the PackageKitBaseBackend python class used byt yum & conary 
is part
    of the packagekit python module and be used by
    'from packagekit.backend import PackageKitBaseBackend'
    added links from python/packagekit  to yum/helpers & conary/helpers so
    that the python code will work when started in the directory.
    make changes to the Makefile's to support the changes.