Migrate pygmt.config tests to dvc #1165
                
     Merged
            
            
          
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Description of proposed changes
Related to #1131.
Reminders
make formatandmake checkto make sure the code follows the style guide.doc/api/index.rst.Slash Commands
You can write slash commands (
/command) in the first line of a comment to performspecific operations. Supported slash commands are:
/format: automatically format and lint the code/test-gmt-dev: run full tests on the latest GMT development version