Begin work on MapPanel

Misc work on MapPanel.
One simple function implemented in DataManager to provide necessary
functionality.
Minor change to getCountryList in DataManager

changed return type to String[], since it’s more useful
More work on MapPanel

Includes many changes to MapPanel, adding of stub of getDataForCountry
to DataManager, and adds a default value to AppButton.id
Merge remote-tracking branch 'origin/Min' into Adam

Conflicts:
	src/project/MapPanel.java
Work in actionPerformed

Implementing skeleton of button event handling, which is now foundering
on the rocks of having no idea how the UI is going to set up/altered
programatically
Merge branch 'Adam'
Adding loadData function
Merge branch 'master' into Min
Switching Panels

Makes the welcome menu button switch to MapPanel