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Parameter Changes
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* The cf standard name mass_concentration_of_chlorophyll_in_sea_water was added to CTDFLUOR [MG/M^3]
* The cf standard name mass_concentration_of_chlorophyll_a_in_sea_water was added to TOT_CHL_A [MG/M^3]
* The field width of BTL_DATE was changed to 8 to match DATE
* The field width of BTL_TIME was changed to 4 to match TIME
* The print precision of CTDXMISS [0-5VDC] was increased to 4.
API Changes
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* A ``WHPName.strfex()`` method was added which formats values passed into it according to the values of ``WHPName.data_type``, ``WHPName.field_width``, and ``WHPName.numeric_precision``.
It will convert NaNs, and anything resulting in an empty string to ``-999``.
The method name was inspired by the datetime method ``strftime``.