Included obm_built_area_size column in obm_tiles

Closed Nicolas Garcia Ospina requested to merge obm-built-up into master

With this command the obm_built_area_size column is added to obm_tiles. It contains built up areas based on the portion of the OBM building footprints that intersect with a tile. also projected to Albers Equal Area.

\approve @ds @fd

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