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Defines the equivalent of :class:`numpy.recarrays` for masked arrays,
where fields can be accessed as attributes.
Note that :class:`numpy.ma.MaskedArray` already supports structured datatypes
and the masking of individual fields.
:author: Pierre Gerard-Marchant
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*IVariables*:
_data : {recarray}
Underlying data, as a record array.
_mask : {boolean array}
Mask of the records. A record is masked when all its fields are masked.
_fieldmask : {boolean recarray}
Record array of booleans, setting the mask of each individual field of each record.
_fill_value : {record}
Filling values for each field.
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