This allows to known the full datalayer behaviour without needing
to load all the data, including the zoom from and to (new settings),
but also the color for example.
This will help also understanding datalayers usage and making
stats.
But no data migration is provided, it's retrocompatible (data
migration in OSM FR servers would be huge, so let's see if it's
really needed).
uMap lets you create maps with OpenStreetMap layers in a minute and embed them in your site.
Because we think that the more OSM will be used, the more OSM will be improved.
Built on top of Django and Leaflet.
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