Renamed Scilab functions can't be called with zero arguments

[khumba]

Scilab supports the following syntax, which the Scilab renamer enables,

cgal.Point_2.new(4, 5);

where cgal and Point_2 are structs. Unfortunately, the Scilab parser has problems when no arguments are given,

cgal.Point_2.new();

giving the error:

 !--error 10000 
%st_e: Wrong value for input argument #1: not a valid field name.
at line      39 of function %st_e called by :  
cgal.Point_2.new()

For constructors, the non-renamed form can be used instead (new_Point_2()). For other functions this is more of a problem because they by default have short arbitrary top-level Scilab names. This shouldn't be a problem for non-static member functions, since they always take at least a this pointer. For other cases, we could add control over the intermediate top-level name (the renamer's member command supports this already).