Implemented voronoi analysis

[dgaubert]

For new analysis use the following checklist:

• Uses the_geom geometry(Geometry, 4326) column for all geospatial operations.
• Outputs a the_geom geometry(Geometry, 4326) column.
• Outputs a cartodb_id numeric column.
• Uses {cache: true} option when it needs full knowledge of the table it. Hints: aggregations, window functions.
• not applicable Uses {cache: true} if it access external services.
• Naming uses a-z lowercase and hyphens.
• All mandatory params cannot be made optional.
• Avoids using CTEs for join operations when result is not cached.

[rochoa]

😂 trade-area?

[dgaubert]

😫