Small Installer improvement

[namtih]

Just 2 small ideas for the installer:
1. As you already download an xml file with information on every start, I think you could add some "last information" to it, which will be presented in an popup after the image was written.
As with Alpha4 brought some issues, you could easily add a link to the bugfix thread to the xml file, so that all new users will get this information.
I think this would be an easy option to share important information.

2. As you already tabs in the installer, I personally would prefer to separate the Write and Backup function on two different tabs. I think this would make it clearer.