#6 Next Extend and Previous Extend make use of the JHistoryButton
#6 the map mode to which the AppBroker can switch, have now the same name as in the MappingComponent. The MapPanel is now a listener of the MappingComponent and notifies the AppBroker if the map mode has changed.
#6 loading a config file works now
#6 switch to the correct interaction mode after the configuration of the MappingComponent
#6 Saving projects works now