Feature: Solution.from_phreeqc to enable import of PHREEQC input files #222
Description
This feature would add a new @classmethod to Solution to enable user to create solution objects directly from a PHREEQC input file.
Solution.from_phreeqc(<path_to_phreeqc_input.pqi>)
Alternatively, this functionality could be added to from_file where the from_file method would detect the extension (.pqi) and parse the file accordingly. I don't know how consistently the pqi extension is used though, so this approach might be slightly more brittle than a dedicated method.
The intention here would be to parse the SOLUTION block of the PHREEQC input file to get composition, pH, pE, temperature, etc. Other features of PHREEQC are not supported.