[mkgmap-dev] Commit r4503: merge the nearby-POI branch which implements and documents new options --nearby-poi-rules and --nearby-poi-rules-config.

Version mkgmap-r4503 was committed by gerd on Mon, 25 May 2020 merge the nearby-POI branch which implements and documents new options --nearby-poi-rules and --nearby-poi-rules-config. http://www.mkgmap.org.uk/websvn/revision.php?repname=mkgmap&rev=4503