[mkgmap-dev] Commit r4370: code cleanup, no change in output expected

Version mkgmap-r4370 was committed by gerd on Thu, 14 Nov 2019 code cleanup, no change in output expected - use more lambdas and computeIfAbsent - merge nested if-then clauses - improve formatting http://www.mkgmap.org.uk/websvn/revision.php?repname=mkgmap&rev=4370