This widget is a button to launch a select file window 
to choose the name of the conduction mesh file.
A filter with the extension ".syr" is proposed by default (corresponding 
to files with a SYRTHES format). 
In case such a format is not available, other extensions are possible 
but need to be converted. A popup window will propose to do the 
file format conversion.
 
One reminds that for the time being, the only extension allowed are :
-  ".syr" : SYRTHES format file 
-  ".des" : Simail native format file 
-  ".med" : Salome format file 
-  ".unv" : Ideas universal format file 
-  ".neu" : Gambit format file 
In the case you have your own format and mesh generator, authors remind 
that the SYRTHES format file is quite simple. It is then advised to 
write your own conversion program towards a SYRTHES format file.________________________
 SYRTHES version   : VERSION_SYRTHES
 Name help file  : Fn_Cd_but.html
 I. Rupp, C. Peniguel  -  may 2014
 ________________________