format: Add 'default' format option (bug #62430) * pr-output.cc (set_format_style): Add format option 'default' to set the same state as if format was called without arguments and overrides other format options if multiple options are provided. * pr-output.cc (format): Update docstring with changes about new 'default' option, function calling form, and errors when both inputs and outputs are specified. * NEWS.8.md: Note change under Matlab Compatability.

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