Hi Tom,

As I previously told you (at least, I believe so but I am not 100% sure), I finished migrating all 
the Python C extensions some time ago. I had discovered some issues with a case of inheritance 
causing unexpected crashes.
To facilitate the debugging, I decided to implement a prototype outside of GDB, and managed to make 
it work. I finally got the prototype reviewed by Victor Stinner, a Python core developer, to 
double-check whether my design was working as expected.

Please find attached my last iteration. I also provided an archive which should be more convenient 
for you if you want to compile and test it.

Could you please review it so that we validate this new approach before I migrate all my previous 
patches to it ?

PS:
- a README is provided with all the needed instruction inside.
- this patch contains code from outside GDB's repository, and should not be merged inside GDB's 
repository.

Regards,
Matthieu