calculate_levels_simple: Calculate compensated water levels above sensor using a pair...
In acgoodman/wlTools: Tools for handling water pressure and salinity data

This function performs barometric compensation and density compensation and save the files

1 2	calculate_levels_simple(wll_csv, baro_csv, wll.type, baro.type = solinst, output.dir, water.density, baro.df = NULL, sensor.elev, navd.dir)

`wll_csv`	the path to a csv file exported directly from the logger software
`baro_csv`	the path to a csv file exported directly from the baro logger software
`wll.type`	the brand of water logger: either 'Hobo' or 'Solinst'
`baro.type`	the brand of baro logger: either 'Hobo' or 'Solinst' or 'df' if using a data frame
`output.dir`	the path to the output directory for the saved files
`water.density`	the average water density for the site, in g/L
`baro.df`	a data frame of baro pressure data and time if not using a CSV. Must have fields "time" and "baro.pressure"
`sensor.elev`	an optional field of absolute sensor elevation
`navd.dir`	the path in which to save logger data with NAVD elevations

calculate_levels_simple(wll_csv = wl.files[[1]],
baro_csv = 'my_baro.csv',
wll.type = 'Solinst',
baro.type = "Solinst",
output.dir = 'CSVs/4_BaroDensCompensated',
water.density = 1003,
sensor.elev = -0.02,
navd.dir = 'CSVs/5_compensated_levels_with_sensor_height'
)