Support for output of ItemValue and ItemArray on ostream
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Beware that this only prints values on the printing processor in parallel (rank 0 processor by now).
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Could also have added SubItem{Value,Array}PerItem outputs and DiscreteFunctionP0, but it remains unclear to me if this development is really relevant, due to the parallel defect of this functionality. In the case of DiscreteFunctionP0, one can use the DiscreteFunctionP0::cellValues() function to print values.