Add a configuration dialog for monav that can be used to set a transport type preference.
It also adds map management features: Details about installed maps, download of new maps and updates of existing maps via knewstuff (rather a minimalistic ghns implementation in qt since we cannot have a kde dependency here).

Make RunnerPlugin::configWidget() non const since configuration changes likely affect the plugin.
Remove GroupBoxes that only contain one subwidget to conserve some space.
Hide directions list view on Maemo.