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  Field - base class for a field of a collection of statistics

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    Create a new field.

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                       available: Specifies python code to apply to other
                                  fields of the parent structure to decide
                                  whether this value is available. Defaults
                                  to True.
                       derived:   Specifies python code to apply to other
                                  fields of the parent structure to derive the
                                  value of this field. Defaults to None.
                       display:   If not True, this field will not be included
                                  in labeled output. Defaults to True.
                       label:     The label for this field. If unspecified, the
                                  label will be derived from the field name.
                       length:    if > 1, indicates this field is an array of
                                  the specified cType, otherwise is is a
                                  scalar. Defaults to 1.
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    Extract the value for this field from a sample.

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    Label a sampled value for this field.

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  A value for numeric statistics which are currently not available; prints
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