Allow to find places via ZIM suggestions

[kelson42]

Here we need to create one "ghost" article per location. Such article only role is to, in HTML, redirect to the right redirection on the map.

[benoit74]

For this v0.1 issue, we could start with

• GeoNames datasets (11 millions places worldwide, CC-BY license)
• create only ADM locations 1 to 4 (ADM1, ADM2, ADM3, ADM4) for simplicity
• add them as ADM4 - ADM3 - ADM2 - ADM1 in the title search, to avoid ambiguities
• also create higher level ones: AMD3 - ADM2 - ADM1, ADM2 - ADM1 and ADM1
• automatically fly to correct lat, long

What I don't know yet is how to find correct zoom level ...