0.8.5

• Added rf_z2_index for constructing a Z2 index on types with bounds.
• Breaking: rf_spatial_index renamed rf_xz2_index to differentiate between XZ2 and Z2 variants.
• Added withSpatialIndex to RasterSourceDataSource to pre-partition tiles based on tile extents mapped to a Z2 space-filling curve
• Add rf_mask_by_bit, rf_mask_by_bits and rf_local_extract_bits to deal with bit packed quality masks. Updated the masking documentation to demonstrate the use of these functions.
• Added toDF extension method to MultibandGeoTiff
• Added rf_agg_extent and rf_agg_reprojected_extent to compute the aggregate extent of a column
• Added rf_proj_raster for constructing a proj_raster structure from individual CRS, Extent, and Tile columns.
• Added rf_render_color_ramp_png to compute PNG byte array for a single tile column, with specified color ramp.
• In rf_ipython, improved rendering of dataframe binary contents with PNG preamble.
• Throw an IllegalArgumentException when attempting to apply a mask to a Tile whose CellType has no NoData defined. (#409)
• Add rf_agg_approx_quantiles function to compute cell quantiles across an entire column.