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OsmAnd live: rework rank computation #135

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@bagage

I'm not sure it's the proper place to address that issue, but I believe that the current rank formula for recipients reward (eg., the more changesets, the better rank) chould be improved:

When you look up first contributors on https://osmand.net/osm_live (sorted by OSM changes), the first ones are simply doing one changeset per node modified (adding tree one by one…).
In the mean time, someone that is importing 100K objects at once (buildings for instance) will do a single changeset. You don't want to have 100K changesets.

In my opinion, these extremes changeset (1K changesets of one node and 10K nodes modified at once) should be both valuated equally. But I believe it should also be equivalent to medium changesets (for instance 10 changesets of 10 modified objects). Maybe these "top contributors" will optimize their rank based on the new formula, but at least it would not encourage people to do lots of small changesets.

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