ToDo:
 * Support multiple instances
 * More data sources
 * More translations
 * Less memory usage(?)
 * Help function
 * Support mirrors of a data source

Ideas:
 * Caching
 * Use glade for the menu
 * Support temperature maps
 * Temperature dependant colored images
 * Dynamic resized icon
 * One xml file for every country
 * Hide the details in an expander widget
 * Search function
 * Make the code more OO
