Add file version to .vik files.
Add map layer option to only download missing tiles.

Useful for low bandwidth and/or pay for data services yet you want the convenience of the autodownload.
Also useful for map types which hardly ever change e.g. BlueMarble,
 so no need to bother the server to ask if there are newer tiles!
[QA] Mark some GPS layer strings for translation.
Add display of bearing of the next potential point in drawing new routes or tracks.

Refactor bearing calculation in ruler drawing to make it available for reuse.