Cbsyst

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* Moved pressure correction back into MyAMI_V2 functions, but still after parameter calculation so speed increase is maintained.
* Added data_out function for exporting data.
* Minor idiot-proofing of minor functions.
* Improved tests.
* General cleanup.

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**Moved pressure correction from MyAMI to cbsyst.**
As the pressure correction factor is multiplicative, it makes no difference to the resulting constants, and is MUCH faster on the cbsyst side.
In MyAMI, pressure correction was involved lower down in generating the K meshes parameter fitting, so a new parameter set had to be calculated for each P.

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* Comparison to GLODAPv2 dataset.
* Implemented pressure corrections.

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* Fixed missing dependency that made Pypi install fail.

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* Initial Pypi Release