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Convert a string to a double precision number
 
Double_Type atof (String_Type s) 
This function converts a string s to a double precision value
and returns the result.  It performs no error checking on the format
of the string.  The function _slang_guess_type may be used to
check the syntax of the string.
 
     define error_checked_atof (s)
     {
        switch (_slang_guess_type (s))
        {
           case Double_Type:
             return atof (s);
        }
        {
           case Integer_Type:
             return double (integer (s));
        }
        verror ("%s is not a double", s);
    }
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