Module envelope

The GDAL/OGR library uses an Envelope structure to hold the bounding
box information for a geometry.  The envelope (bounding box) contains
two pairs of coordinates, one for the lower left coordinate and one
for the upper right coordinate:

                          +----------o Upper right; (max_x, max_y)
                          |          |
                          |          |
                          |          |
Lower left (min_x, min_y) o----------+
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