obslog: add display of precursor information to the default template This will still only be output when the user passes --precursors to the command (otherwise the data just won't be there). This addresses a common user request, where they actually would find more intuitive to use --precursors --no-successors.

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test-drop.t

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test-inhibit.t

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test-simple4server.t

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tests/test-simple4server-bundle2.t