Chris Mutel  committed 66516d1

Documentation on pickle instead of numpy.tofile

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File bw2data/

 Processed arrays are saved in the ``processed`` directory.
+Uses ``pickle`` instead of the native NumPy ``.tofile()``. Although pickle is ~2 times slower, this difference in speed has no practical effect (e.g. one twentieth of a second slower for ecoinvent 2.2), and the numpy ``fromfile`` and ``tofile`` functions don't preserve the datatype of structured arrays.
 The structure for processed inventory databases includes additional columns beyond the basic ``stats_arrays`` format:
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