bionapltobiogeochem and biogeochemtobionapl working

The two interface functions seems to be working with inputting and
outputting the values from the external transp_elem array.

There's a lot o trickery in the array mapping for input and output
to match the general transp_array with the separate arrays that
phreeqc gives out. It holds with the present structure, but
several caveats must be considered, as including the biomass
as a reactant with known mass.