-1 values to NA in tph_to_vector and tph_to_table, ensuring that missing data is handled correctly.Bugs fixed in tph_to_raster, now the grid is correctly aligned with the reference GISCO grid.
tph_to_raster now also generates GISCO grid IDs in the second layer of the raster.
New function tph_to_vector to convert TPH data to a vector formats.
New function tph_to_table to convert TPH data to a simple table data.frame.