contour-isobands-rs

• Change (again) the 'precision' value used to distinguish between two contiguous bands.

• Fix bug in area function. Note that given the use made of this function, it shouldn't have cause issues with the contours created.

• Change the 'precision' value used to distinguish between two contiguous bands.

• Simplify some minor stuff in trance_band_paths function.

• Slightly improve performance of ContourBuilder::contours / ContourBuilder::par_contours methods.

• Add new par_contours method to ContourBuilder to generate contours in parallel (only available with the parallel feature flag).

• Fix assignment of interior rings when a polygon with a hole is contained in the hole of another polygon (on the same band).

• Use more idiomatic code for area and contains functions.

• Don't store cval on Cell struct.

• Avoid pulling and compiling serde_json when the geojson feature is not enabled.

• Improve documentation and README.

• Add executable example.

• Ensure correct winding order of polygon rings.

• Remove repeated point in polygon rings if any.

• Avoid cloning some values when reconstructing polygons.

First release.