[packagekit] Fix show percentage in Katja backend during download

[Richard Hughes]

On 8 December 2014 at 14:51, Sasa Ostrouska <casaxa at gmail.com> wrote:
> Hi Richard, many thanks for the answer, in my opinion it is way more logical
> to have it for each task showing the percentage of the completion of task.

Why is that more logical? If you provide multiple 0->100% phases then
you also need to provide a percentage report of how many phases there
are going to be. The frontend just needs to know if the task is
completely done, or half done, or only just started. Per-package
progress can be communicated using ItemProgress.

Richard