[Cython] new patch for #255 (Py->C for integrals) in the tracker

[Lisandro Dalcin]

- The changes to ModuleNode.py and Utils.py are just quick hacks to
get it working.

- I've tried hard to avoid generation of unreachable code like these
"if (0) {...}" blocks.

- Once this is reviewed, commented and eventually accepted, I'll
continue extending this to extern ctypedef integrals.


-- 
Lisandro Dalcín
---------------
Centro Internacional de Métodos Computacionales en Ingeniería (CIMEC)
Instituto de Desarrollo Tecnológico para la Industria Química (INTEC)
Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)
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