IRN (Iran)

Most large sources only cover IRAN_ADM0-2, however, there is text-based evidence for the existence of IRN_ADM3 and IRN_ADM4 (https://en.wikipedia.org/wiki/Administrative_divisions_of_Iran and https://www.amar.org.ir/Portals/0/Geo/GEO94-summary.pdf). We were able to locate these sources, and, though they contain some gaps, will include them in our 4.0 release (as gB only requires contiguous boundaries from levels 0-2). More discussion or contributions on this topic are welcome.