help_skeleton — build the skeleton of the xml help file associated to a Scilab function
txt = help_skeleton(funname [,path [,language]])
character string : the name of the function
character string : the path where the file will be create if required. If this argument is not given the skeleton is returned as a string.
character string :with possible value "fr_FR" or "en_US" the defaultis "en_US"
the XML code or the complete xml file path
txt = help_skeleton(funname) generates a vector
    of strings containing the skeleton of the XML code describing the help of
    the function funname.
fullpath = help_skeleton(funname,dirpath)
    generates the XML code describing the help of the function
    funname in a file named funname.xml
    in the directory specified by the path dirpath. In this
    case the function returns the file path.