[platform-update-dev] redesigned install wizard

[Dorian Birsan <birsan@xxxxxxxxxx>]

There have been a number of bugs related
to the poor performance of the update server, so I have made a number of
changes to the install wizard that should improve the usability and the
perceived performance:
1. searching for update sites is now
done in a background job. In fact, there is now on type of background job
used by both automatic updates and the regular install wizard.
2. with this change, the install wizard
is actually broken down into two wizards, the second wizard starting to
what it used to be the results page.
3. Basically, all the network related
stuff should can now be moved to a background job by the user.
4. There is one drawback: the support
for mirrors has not been ported to the new redesigned wizard. If anybody
has suggestion (or patches :-) for how to handle this please post here
or open a bug report. With these changes, I think the support for mirroring
won't be as important as in the past. By the way, has anybody used the
update site mirrors? Another take on this would be to combine the existing
update site policy with update site mirrors, perhaps by settings on the
preference page.
5. The wizard pages for sites, results
and location page have been redone, based on feedback from various bug
reports and discussions.

-Dorian