This function alters the output parameters of your SWAP input files.
set_swap_output(parameters, variables, depths, verbose = F)
parameter dataframe as returned by parse_swap_file()
variables desired for output (string)
depths depth at which to output them (string)
print status? (flag)
Returns parameter dataframe with modified INLIST_CSV parameter.
Currently it only modifies INLIST_CSV, but more functionality will be placed here over time.