[mkgmap-dev] Commit r4599: improve handling of options when creating the overview map (now really with overview-v6.patch by Ticker Berkin)

Version mkgmap-r4599 was committed by gerd on Sun, 24 Jan 2021 improve handling of options when creating the overview map (now really with overview-v6.patch by Ticker Berkin) (last commit was overview-v5.patch) http://www.mkgmap.org.uk/websvn/revision.php?repname=mkgmap&rev=4599