Bug in calculation of relative humidity if inputs are vapor pressure or specific humidity

[dschlaep]

Relative humidity is incorrectly calculated since https://github.com/DrylandEcology/SOILWAT2/releases/tag/v7.0.0
(as introduced with 7f9da8c) in two cases

1. Daily weather inputs provide vapor pressure (and no relative humidity)
   This is the case with Daymet: the code currently calculates relative humidity as proportion [0, 1] instead of as percentage [0, 100]. For example:

bin/sw_test --gtest_filter=*Daymet*

WeatherFixtureTest.WeatherInputDaymet
calc hurs=0.733103: vp=0.300000, tas=-4.785000, svp=0.409219
...
calc hurs=0.691217: vp=0.410000, tas=-0.365000, svp=0.593157
...

This is caused by https://github.com/DrylandEcology/SOILWAT2/blob/34bd4bf69ce9b31f94e639cb1133eeceac1df3df/src/SW_Weather.c#L1900C21-L1901C88

yearWeather->r_humidity_daily[doy] = yearWeather->actualVaporPressure[doy] / svpVal;

which should correctly be

yearWeather->r_humidity_daily[doy] = 100 * yearWeather->actualVaporPressure[doy] / svpVal;

2. Daily weather inputs provide specific humidity (and no relative humidity)
   This can be the case with MACA: the code currently calculates relative humidity in most cases as either 0 or 100% because of an incorrect estimate of saturated vapor pressure. For example:

bin/sw_test --gtest_filter=*MACAtype2*

WeatherFixtureTest.WeatherInputMACAtype2
calc hurs=100.000000: e = 1443.461744 / es = 0.000000, tas=-6.000000, huss=1.920000
...
calc hurs=0.000000: e = 1745.159779 / es = 6767936096406505376448512.000000, tas=3.445000, huss=3.070000
...

This is caused by https://github.com/DrylandEcology/SOILWAT2/blob/34bd4bf69ce9b31f94e639cb1133eeceac1df3df/src/SW_Weather.c#L1822C21-L1823C64

es = (6.112 * exp(17.67 * yearWeather->temp_avg[doy]) / (yearWeather->temp_avg[doy] + 243.5));

which should correctly be

es = 6.112 * exp((17.67 * yearWeather->temp_avg[doy]) / (yearWeather->temp_avg[doy] + 243.5));