add keyword argument to itertools.chain [was Feature Proposal: Sequence .join method]

[David Murmann]

Hi again,

i wrote a small patch that changes itertools.chain to take a "link"
keyword argument. If given, it is iterated between the normal arguments,
otherwise the behavior is unchanged.

I'd like to hear your opinion on both, the functionality and the actual
implementation (as this is one of the first things i ever wrote in C).

till then,
David.
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