soc-2008-mxcurioni: reimplemented the initialization/allocation for base classes. The Python object type tp_new slot is now set to PyType_GenericNew, instead of the former custom functions. As a note, by default, Python does not set this slot: it is therefore mandatory for the base classes. For children classes, only __init__ is needed.

To make our base classes subclasses, the Py_TPFLAGS_BASETYPE flag was added to the object type tp_flags slot.

Finally, I began to implement CurvePoint, descendant of Interface0D. This commit allowed me to verify that my SWIG replacement method works: interfaces are well taken into account by children. For a test, use the following code:

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import Blender
from Blender import Freestyle
from Blender.Freestyle import *

print Interface0D()
print CurvePoint()

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The __repr__ method is only implemented in Interface0D:

PyObject * Interface0D___repr__(BPy_Interface0D* self)
{
   return PyString_FromFormat("type: %s - address: %p", self->if0D->getExactTypeName().c_str(), self->if0D );}

and the result is of the form:

type: Interface0D - address: 0x18e5ccc0
type: CurvePoint - address: 0x18e473f0

As you can see, the correct getExactTypeName of the class is called. 

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