Set autologin profile via the GUI


PR #1540 added the option for auto login of a specific selected user profile.
This PR exposing this new setting to the skin and adds support for it in Confluence.

This concludes the refactoring of the patches provided by bruing in trac [10708](http://trac.xbmc.org/ticket/10708). This PR contains patches 2 and 3.

![screenshot000](https://f.cloud.github.com/assets/671891/358696/23894026-a149-11e2-9522-162ef575e91e.png)
![screenshot002](https://f.cloud.github.com/assets/671891/358697/2394eb42-a149-11e2-95d8-b9dadb287186.png)
![screenshot003](https://f.cloud.github.com/assets/671891/358698/239dd7b6-a149-11e2-9e17-12abf1015470.png)