Set the fillColor to indicate if the document owns its geometry.

Previously the color would only change if the geometry was about to be newly
added.
This prevents documents to cross-link geometries.

I.e. if documents a and b are uploaded and in #reduce, I point a's
GeoJSON_clone to b, I then forbid b from being displayed for geometry
selection.
I ended up linking a to b and vice versa, because when clicking though hundreds
of polygons you can't always keep track.
Employed reference counting for cross-link prevention logic.

As always it was more complicated than that; if multiple links are involved, a
feature may be in-hidden even if other features still link to its geometry.
Hid suggestions for geometries that already link to other geometries.

So if I set A to link to B, then C would not suggest A anymore. And as before,
B would be skipped entirely.
Still unsure if I am on the safe side here.
Applied map.html formatting to the other pages.