inarg: needboreplot_2015060612_0120_0186_0114_0190_111_016.
 today2: 20150607
 today3: 20150608
input of propagation direction done in command line.
ho has not been defined by the user, will be calculated by tools.
properties of density current not set by user, will be calclated using other methods.
density of ambient air is larger than the density of cold air.  Check.