Apply hysteresis and tau correction to Oxygen SBE43 data

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Currently for the tau correction I am only calculating dvdt between the prior and current voltage values. Seabird indicates that this should be calculated using a 2 second window, which with a sampling rate of 4hz, would be 8 voltage readings.

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For the hysteresis correction, the equation is listed in the Seabird Application Note 64.3, p. 6

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In talking with Seabird personnel, the tau correction dv/dt value is actually calculated as:

It's the change in volts from the SBE43 over the change in time it takes the instrument to travel 2 decibars during the profile.