Add a subtitle in the callout when the station is closed.

#20
Do not try to update individual stations if it's impossible.
Fix updates in Cities with regions but no individual updates. (e.g. Rennes)
Tweak AnnotationView font and colors, #20
Tweak annotation view colors,

fixes #20
Better drawing of the Region AVs.

remove the regions from Rennes, since we can't display properly and there aren't that many stations anyway.