Two new members have been added to Grid3DObject, to store the heights of the 3D levels (ie: level 1 = 10m above ground, etc). This is similar as what is done by ARPS, GRIB, etc A boolean specifies if these are absolute or relative heights (ie: above DEM).

The unventilated temperatures filter and unheated rain gauge filter have been renamed. The "soft" option has been added to Unheated_RainGauge. And the usual documentation fixes...