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

[Lisandro Dalcin]

I've uploaded an updated version of the patch for #255.

It is an attempt to reimplement __Pyx_PyNumber_Int() in an smarter
way. Moreover, I've tried to mimic the error messages in core CPython.

Additionally, I've extended the testcase to test for user classes
defining __int__()/__long__(). So far, this test pass on Linux 32 with
Python 2.3 to 2.7 (recent trunk checkout) and 3.0.1

-- 
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)
PTLC - Güemes 3450, (3000) Santa Fe, Argentina
Tel/Fax: +54-(0)342-451.1594