[mkgmap-dev] Commit r3857: - refactoring to improve readability of code for high precision

Version mkgmap-r3857 was committed by gerd on Tue, 21 Mar 2017 - refactoring to improve readability of code for high precision - add TODO for 32 bit high prec based on modified diff_coord_v3.patch http://www.mkgmap.org.uk/websvn/revision.php?repname=mkgmap&rev=3857