Cbsyst

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Technical: Stopped including all GLODAP data in bdist_wheel to reduce file size.

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Delegate all K calculation to external packages:
* [kgen](https://github.com/PalaeoCarb/Kgen) for K calculation.
* [pymyami](https://github.com/PalaeoCarb/MyAMI) for adjusting Ks for seawater major ion composition.

Main code changes:
* Strip out all old MyAMI code
* re-organise carbon, boron, and boron isotope functions
* Added in additional B isotope functions for palaeo-calculations
* Functionality for providing B isotopes instead of pH for the main functions.

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(including changes from 0.3.6... shoddy record keeping)

* Fixed MyAMI_V2 to match original Matlab version (typo in temperature parameter)
* Revelle factor calculation.
* pH scale conversion calculator
* Allow specification of TS and TF
* Test updates to reflect changes
* general bug fixes
* Makefile for testing and distribution.
* Logo!

Thanks to douglascoenen for typo correction.

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* Bring CBsys in line with new changes.

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* CO2SYS comparison with GLODAPv2 Bottle data.
* Minor parameter fixes and equation updates to match CO2SYS.
* pH scale correction of KP1, KP2, KP3, KSi and KW

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* Implemented nutrient alkalinity for all except CO3_TA and HCO3_TA cases using parameterisation of Matlab CO2SYS.