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Parameter Changes
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* Add 370nm as a wavelength for CDOM
* Update CF Standard Name table to version 81
* Updated the CTDBTA700 [M^-1/SR] warning to indicate this is for a parameter with a centroid angle of 142 degrees.
* Add CTDORP [MILLIVOLTS] that describes a sensor measuring the tendency for chemicals in the water to gain to lose electrons, useful for hydrothermal plume tracking.
* Added/Restored CTDBETA650_123 [M^-1/SR] for the volume scattering function at 650nm with a centroid angle of 123 degrees
* Add D15N_TDN [/MILLE] that describes the enrichment of stable 15-nitrogen isotope in total dissolved nitrogen
* Add 14C-DIC [/MILLE] as an alias for DELC14 [/MILLE]
* Add D15N_ALPHA_N2O [/MILLE] to describe N2O where the center nitrogen has been substituted with 15-N
* Clarify that D15N_N2O [/MILLE] is a substitution in either nitrogen position
* Add NMOL/L as a unit for N2O
* Add CARBONATE [UMOL/KG] for dissolved concentration of the carbonate ion
* Add HFC-134A [PMOL/KG] for dissolved concentration of 1,1,1,2-Tetrafluoroethane
* Add HFC-125 [PMOL/KG] for dissolved concentration of pentafluoroethane
* Add NMOL/L as a volume unit for IODATE
* Add E7/KG as an acceptable unit for I-129 when reported in amount of substance per unit mass, E7 meaning 10^7 atoms following existing unit conventions in this database
API Changes
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* Internal refactor removing the LazyMapping class in favor of collections.UserDict, there should be no user facing changes.