pickle iterators and generators about dill HOT 5 OPEN

@hyiltiz: A generator is dependent on a frame object, so it's difficult. It can be done, but I believe requires C code.

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python has done just exactly this, starting with python3.4

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Also, less obvious is how to pickle a generator. It "can't be done" with ctypes, last time I checked. However, some good notes/links are here: http://stackoverflow.com/questions/7180212/why-cant-generators-be-pickled/7180424#7180424

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also, itertools.islice is useful for dumping the first "X" values, so the last known position is restored

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I noticed that generator can't be dilled according to the docs. Is there any plans to support it, or it is something fundamentally imposisble to implement? Intuitively, it should be much easier to implement than frames or tracebacks, since lambdas can be dilled already.

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