Show depth values
Show depth values

* Increase the zoom level for the base map.
* Configure the base map to zoom the tile images on client side
  for zoom levels > 19.
* Change layer names for the track point layer.

[4e29c1af880a04b58e2bf1aa4ff25f718ca13d6e@bezono.org: changed commit message.]
[4e29c1af880a04b58e2bf1aa4ff25f718ca13d6e@bezono.org: removed superfluous method 'createLayer' (dead code).]
[4e29c1af880a04b58e2bf1aa4ff25f718ca13d6e@bezono.org: did some minor code style changes.]
Signed-off-by: Dominik Fässler <4e29c1af880a04b58e2bf1aa4ff25f718ca13d6e@bezono.org>

fusionstream/depth,fusionstream/depth,cleanerx/depth,cleanerx/depth,cleanerx/depth,fusionstream/depth