[packagekit] moving the helpers

[Richard Hughes]

At the moment we have:

helpers/$backend-FILES

as the number of backends grows, we are going to have _lots_ of files
in the helpers/ directory.

I propose moving the files into:

helpers/yum/*.py
helpers/conary/*.py
helpers/box/*.sh
helpers/urpmi/*.pl

and just symlinking the sharded files (packagekit.py for example) to
whatever needs it. git works well with symlinks so this isn't a
problem.

I think I'll do this move tomorrow (unless there are any objections) -
so please try to get your changes onto the server if you have
uncommitted or un-pushed changes.

Thanks guys.

Richard.