Transposed inputs for a 5× speed-up

• Transposed all inputs to the excess Gibbs energy function and its derivatives, giving about a 5× speed-up;
• For consistency with Pitzer.jl:
  • Simplified osmotic coefficient calculation approach;
  • Added direct calculation of water activity by differentiation;
  • Changed both T and temp to tempK in input files and all functions;
  • Renamed coefficient "dictionary" as "library":
    • CoefficientDictionary class becomes CoeffLib;
    • cfdict function inputs become cflib;
  • Updated documentation to reflect these changes;
• Added io.saveall function to create CSV file for results;
• Switched CoeffLib.get_contents() to use dict key names, not function names, to find ions.