Let pscoast -E accept reading other DCW type files made by users. #8546
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In GMT.jl I added a function that reads an OGR file containing country borders and attributes describing each country polygon with 2 or 3 chars ISO codes and create a file with the same structure as the dcw-gmt.nc file.
That file can then be read by pscoast via -E like the official DCW file. In order to do it the +f modifier was added.
Besides that, this PR adds also the continent WD to mean the entire world.
I have prepared one of such DCW files with data from https://public.opendatasoft.com/explore/dataset/world-administrative-boundaries/export/ and made it available at the gmtsetver /export/gmtserver/gmt/data/geography/dcw/ODS.nc.
It is only 1.3 MB big and with it we can do:
I have also a 60 MB file with the OSM countries if anyone is interested.