- All functions now support tetrads (2 km squares, also known as "DINTY" system, e.g. "N85H") (#3).
igr_to_ig()andst_igr_to_ig()can (optionally) return centroids of Irish grid references (#8).- All functions have additional hardening against invalid parameters (#5).
- README & vignette refinements including compatibility with latest development version of tmap 4.0.0 (#4).