mappings: Added autogen Veg+-VegCore.to_self.csv, which is Veg+-VegCore.csv joined to itself, and use it as an intermediate map to join to VegCore-VegBIEN.csv. This provides support for two-level chains of mappings in Veg+-VegCore.csv.
mappings: Added autogen Veg+-VegCore.to_self.csv, which is Veg+-VegCore.csv joined to itself, and use it as an intermediate map to join to VegCore-VegBIEN.csv. This provides support for two-level chains of mappings in Veg+-VegCore.csv.