[patch] Support inferior events in python

[sami wagiaalla]

> Sami>  +
> Sami>  +  if (!thread_event_obj || !thread)
> Sami>  +    goto fail;
>
> You have to do error checks after each Python call, you can't batch them.
>

I have split the error checking.

> Either: create_event_object can fail, in which case it is not ok to call
> get_event_thread on failure; or, create_event_object can return NULL but
> not set a Python exception, in which case you must set one explicitly.
>

Did you mean "or, get_event_thread" here ? I assumed so because 
get_event_thread can indeed return NULL without setting an error. I have 
fixed that be adding a call to PyErr_SetString.  create_event_object on 
the other hand fails only due to failures in calls into the Python api. 
Which, presumably, do set errors.

Sami
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