Add --nested-fields={error,omit,json} for CSV #55
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These apply to both `cat` and `head` subcommands, and specify how to handle nested fields if the output format is CSV (which does not support nested fields). The default, `--nested-fields=error`, just exits with a helpful error message. This also changes the printing of errors escaping from the `main()` function to use `Display`, rather than `Debug`, in order to make them more user-friendly. Fixes manojkarthick#54.
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These apply to both
catandheadsubcommands, and specify how to handle nested fields if the output format is CSV (which does not support nested fields). The default,--nested-fields=error, just exits with a helpful error message.This also changes the printing of errors escaping from the
main()function to useDisplay, rather thanDebug, in order to make them more user-friendly:Fixes #54.