[mkgmap-dev] Commit r4649: diagnostics.patch by Mike Baggaley

Version mkgmap-r4649 was committed by gerd on Sat, 10 Apr 2021 diagnostics.patch by Mike Baggaley - diagnostic messages are now written to stderr unless using a logging configuration without a ConsoleHandler - diagnostic messages have the level DIAGNOSTIC when they are logged. Before some had WARNING, some had INFO. - deprecate option --check-routing-island-len, replaced by new options --report-routing-islands and --max-routing-island-len - change documentation for options --report-similar-arcs and --report-dead-ends http://www.mkgmap.org.uk/websvn/revision.php?repname=mkgmap&rev=4649