Doc: selecting run environment in run settings

Change-Id: I02f2bc70733e03b9b340c37019fef5d6a7af6872
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>
Qbs: Be more paranoid when setting the log level

Change-Id: I134c6eefeff285ed8953c7b35c249ea757692c34
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>