This widget is a field where users can indicate 
the name of weather file.
This field is accessible only if the check-box  "weather data" is activated 
It is particularly 
usefull when dealing with humidity models, solar radiation and more generally 
thermal aspects in buildings.
The content and format of a "weather 
file" are described in the SYRTHES documentation.
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 SYRTHES version   : VERSION_SYRTHES
 Name help file  : Fn_Mt_lne.html
 I. Rupp, C. Peniguel  -  may 2014
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