gravitational acceleration was not a default parameter in spins.conf (required for baroclinic vorticity).

**Donovan Allum**
(76d875c2)
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at
30 Apr 17:25
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added g to spins.conf in /cases/derivatives/

Merged the computation of the baroclinic vorticity in Jan 2021 but forgot to add a flag to spins.conf to turn on/off this computation. Changes are only made to the spins.conf in the directory /src/cases/derivatives/

**Donovan Allum**
(8e768d2d)
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at
16 Apr 14:42
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Added flag to spins.conf for derivatives.cpp to compute Baroclinic ...

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... and
12 more commits
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The goal for this change was to edit derivatives.cpp so that users can also calculate the baroclinic vorticity under the boussinesq approximation.

The following files were added:

- compute_baroclinic_vort.cpp: Calculates the magnitude of the baroclinic vorticity
- compute_baroclinic_vort_x.cpp: Calculates the x-component of the baroclinic vorticity
- compute_baroclinic_vort_y.cpp: Calculates the y-component of the baroclinic vorticity

The following files were edited:

- Science.hpp: Adding the new files above to this header file. Also added inline functions eqn_of_state_dT and eqn_of_state_dS to calculate the derivative of the equation of state with respect to temperature and salinity (The latter inline function was written but not used but could be required for future work).
- derivatives.cpp: Changed this casefile to calculate the magnitude and components of the baroclinic vorticity using the new files above for each output as defined in /cases/derivatives/spins.conf

**Note:** There is no z-component for the baroclinic vorticity assuming that gravity is limited to the z-direction.

**Donovan Allum**
(01972559)
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at
11 Jan 16:17
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Added the baroclinic vorticity as a new output for the derivatives ...