"IGPP Earth North-South Deflections" dataset: Fix "south-north" to "north-south"#131

Esteban82 merged 3 commits intoGenericMappingTools:mainGenericMappingTools/remote-datasets:mainfrom

yvonnefroehlich:update-name-ndefl-docyvonnefroehlich/remote-datasets:update-name-ndefl-docCopy head branch name to clipboard