Define updated U.I. for the Platform 5.5 wizard

We decided to do the new Platform user interface choice where people will pick between DM or CMF in the Wizard.
This means we need to update the wizard.

• adding a screen

Screen should say

"
Applications:

Choose the configuration of your Nuxeo Platform:
() Basic / Naked (CAP)
() Advanced Document Management (DM)
[ ] With Digital Asset Management features (DAM)
[ ] With Collaboration features (social collab)
() Case Management Framework (CMF)"

We should also have an icon for that.
In terms of position, I would do it after the Connect registration but we can discuss about this.

Also the Wizard should have a new title. It should be now "Nuxeo Platform" and may be it would be time to use the same background on the right iframe than in the center frame (this was a mistake form the past... )