[Cython] prange CEP updated

[Dag Sverre Seljebotn]

I've done a pretty major revision to the prange CEP, bringing in a lot 
of the feedback.

Thread-private variables are now split in two cases:

  i) The safe cases, which really require very little technical 
knowledge -> automatically inferred

  ii) As an advanced feature, unsafe cases that requires some knowledge 
of threading -> must be explicitly declared

I think this split simplifies things a great deal.

I'm rather excited over this now; this could turn out to be a really 
user-friendly and safe feature that would not only allow us to support 
OpenMP-like threading, but be more convenient to use in a range of 
common cases.

http://wiki.cython.org/enhancements/prange 
<http://wiki.cython.org/enhancements/prange#preview>

Dag Sverre
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