version 2.3.0

add: Live Tracking feature (to user-defined URL)

add: ability to set one map as Map Overlay to another

add: new icon "Bus" for tracks

chg: removed Download tab in map manager. Downloading is now directly from first Online tab

chg: date and time pickers to Android default style

fix: final waypoint problems when update cache

fix: fix ignored "Route only" parameter when computing route

fix: better handling of duplicate Root folders

fix: some "force close" fixes