initial code for met2CF.csv

written to take a "format" list based on the info in the formats table, thus should be able to convert any csv met file. Have only implemented 3 variables at this point, but the pattern looks generalizable. Still need to deal with special cases of when UDUNITS can't manage conversions (e.g. Kg/s -> mm) and variable calculations (e.g. vector wind, VPD/RH/SH)