• Add -calc command for calculating simple statistics about a data layer using a JS expression. Functions include sum() median() average() min() max() count().
• Add function for finding interior points of polygon features, for anchoring symbols and labels.
• Add inner and centroid options to the -points command -- for creating a layer of centroids or interior points from a polygon layer
• Add -sort command for sorting the features in a layer
• -o id-field= now supports a comma-sep. list of field names -- useful for assigning ids to multiple TopoJSON objects with different data properties.