[packagekit] Add support for package size and file list in description call

[Robin Norwood]

Hi,

Here's a patch to take care of these TODO items:

*** Add files in package into Description signal ***
We need a way to get the installed files into the UI.

*** Add package size into description signal ***
We need a way to work out how long something is going to take, and
to expose in the UI.


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However, I've mucked up something in pcon:

[rnorwood at solitude PackageKit]$ pkcon get description "libxml2-devel;2.6.30-1;i386;installed"

** (process:19058): WARNING **: No marshaller for signature of signal 'Description'

And I'm not sure what I broke to cause it.

pk-frontend-test.py works fine.

Also, I only added support to the yum and dummy backends, because I
couldn't figure out the others.

-RN

-- 
Robin Norwood
Red Hat, Inc.

"The Sage does nothing, yet nothing remains undone."
-Lao Tzu, Te Tao Ching