Adds polycal algorithm (work in progress)
Adds finishing touches and test for the polycals algorithm.
Optimizing pH functions, and fixing some errors in the code
Edits readme for ph functions and adds some minor tweaks
Adds the polycals cython extension
Merge pull request #160 from cwingard/phsen

CIDEVMI-1037 Updates and Optimizes PHSEN Calculations
Merge pull request #162 from lukecampbell/cals

M086 - Polynominal Calibrations (Secondary Calibrations)
OPTAA tscor wavelength range extension
Merge pull request #163 from desiderr/tscorfix

CIDEVMI-1069: OPTAA tscor wavelength range extension