[openstreetmap/openstreetmap-website] Downloaded map images do not have a copyright/attribution message (#551)

[Hartmut Holzgraefe]

@mmd-osm The code in the original maposmatic repository has not been maintained in quite a while, the acual copyright notice generation has become more complicated in my fork as it now also adds copyright information for the base style and all optional overlay styles to the text. What's also not shown in that part of the code is how the extra white space around the map area is added before rendering the map and the annotation text. But yes, those snippets above show the general idea.

The actual annotation message construction now looks like this:

https://github.com/hholzgra/ocitysmap/blob/master/ocitysmap/layoutlib/single_page_renderers.py#L371

But as far as I remember the export on osm.org only supports the CartoOSM style anyway, not the other three styles, and there are no optional overlays there anyway, so the mostly static text from the original maposmatic code should already do.

It would just need to be changed to mention the ODBL instead of CC-By-SA for the map data itself, the text in the original maposmatic branch is still from before the big license change ... 

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