Upgrade OpenLayers to 2.13.1
Hide pink tiles for unknown tiles

Some layers (e.g. seamark, sports) only render tiles where
an object exists. Unknown tiles are displayed in pink by
default. We change this behaviour by hiding these tiles.
Overwrite OpenLayers Bing module

OpenLayers version 2.13.x contains a class for the Bing
layer. It was necessary to overwrite the 'initLayout'
function.
Remove separate OSM classes

The extra OSM classes are not required anymore. To render the 'Mapnik'
base layer, the 'XYZ' layer class will be used.
Remove unnecessary map configuration options

Since OpenLayers 2.13.x most map configuration options can
be removed.
Let base layers wrap the date line

With these settings, the base layer can not be zoomed below zoom
level 3. But the advantage is that other features like the
graticules or trip planner will work as expected.
Use feature attributes on map download layer

The map download layer used a part of the vector feature id as
reference and stored additional information in a separate
array. The id format has changed in the new OpenLayers version.

The vector feature supports own attributes. This patch uses
the attributes instead of the id to store additional information.
Use 'selectFeature' method from ModifyFeature

Use the 'selectFeature' method instead of directly accessing
the select control. The direct access does not work with the new
OpenLayers version.
Merge branch 'openlayers-2.13.1'
Add elevation profile layer

* Elevation profile layer
* Change view menu