This combo_box  allows to choose between two options of   very complex  coupled heat and mass 
tranfer models combined with humidity models (corresponding theoritical aspects have been proposed by Thierry Duforestel (EDF R&D)). 
Two major options are included: 
-  a model solving Temperature (T) and vapor pressure (Pv) 
-  a model solving Temperature (T), vapor pressure (Pv) and total pressure (Pt) 
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 SYRTHES version   : VERSION_SYRTHES
 Name help file  : Hm_cmb.html
 I. Rupp, C. Peniguel  -  may 2014
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