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Workspace Method cloudboxSetAutomatically
Sets the cloud box to encompass the cloud given by the entries
This WSM handles one Tensor4 type *particle_field* at a time. It can
be used to determine the cloudbox from particle_bulkprop_field
The function must be called before executing any WSM that applies
The function iterates over all 3D fields in *particle_field* (which
might correspond to different particle bulk properties as in
particle_bulkprop_field). Each field is searched for the first
and last pressure index, where the value is unequal to zero. This
index is then copied to cloudbox_limits.
If *particle_field* is empty, the cloudbox is switched off
Additionaly the lower cloudbox_limit is altered by *cloudbox_margin*.
The margin is given as a height difference in meters and transformed
into a pressure (via isothermal barometric height formula). This
alteration is to ensure covering photons that leave the cloud, but
reenter through a limb path.
If *cloudbox_margin* is set to -1 (default), the cloudbox will extend
to the surface. Hence, the lower cloudbox_limit is set to 0 (index
of first pressure level).
*cloudbox_margin* will be applied on each call of the WSM.
Works only for *atmosphere_dim==1.*
Authors: Jana Mendrok, Daniel Kreyling