[Cython] #303 + simplifying type system

[Dag Sverre Seljebotn]

Lisandro Dalcin wrote:
> Your patch looks good.
> 
> BTW, further work on this would require to push my patch for #287.

As you are confident in it I think we should just go ahead, and I'll 
include it in the release candidate testing. We are already way past a 
"bugfix-only" kind of release (that was never the intention with 0.11.2 
either). Will you push?

So, for the release notes, your changes in this release sums up (from 
the end-user perspective as):

- Converting negative Python integers to unsigned C types now results in 
OverflowError (or was that 0.11.1?)

- When converting an object to C integers, __int__ is considered before 
__long__ regardless of the target type.

Correct?

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Dag Sverre