This function changes a SWAP parameter. It is passed a parameter dataframe
as parsed by parse_swap_file()
as well as the name of the parameter which
should be modified, along with its value.
change_swap_parameter(param, name, value, verbose = F)
This function returns the same dataframe it was passed, with the parameter value altered.
Important: this function only works for single parameters. Any values stored as "tables" in the SWAP input file will need to be modified in another way (WIP)
Note: the value of the parameter should be passed as a string in the correct format (ie. correct decimal place), as SWAP/FORTRAN is very particular about this