[mkgmap-dev] [Patch v2] - avoid duplicate boundary nodes when generating islands

Hi Marko, Here's another cut at a fix for the warning you were getting. If you have time, please try this patch without the other patch I posted earlier today (the one that got rid of the warning by allowing the merge to be done). If successful, I intend to commit both this patch and the one that does the merge because they are both useful. Mark