[CL] Assign chemical fomula alternative to a component
As titled, this pull request allows to assign chemical formula alternative to a component. As its result, the given chemical formula will be added in the generated phreeqc input file when defining water composition, followed by the molarity of the component. The below gives an application example. One may write in the prj file as follows,
<components> <component chemical_formula = "HCO3">Synthetica</component> <component>Syntheticb</component> <component>Syntheticc</component> <component chemical_formula = "Fe(2)">Syntheticd</component> </components>
What appears in the phreeqc input file may look like
SOLUTION xxx Synthetica 0.001 as HCO3
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