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Description of proposed changes
As discussed in #6288, I unfortunately selected -M as the option for adding interior margins for a map inset, even though -C as used in subplot is the most comparable situation. This PR rectifies this by switching inset to use -C but of course retaining backwards compatibility with any -M use. Some related points:
All tests still pass as before, the documentation has been updated. Once this PR is approved and merged I will enhance the -C option in subplot to be equally flexible.