iteratee patch: unfoldConvStream: workaround for space leak problem

[Akio Takano]

Hi,

Attached is a proposed patch for the space leak problem discussed by
Maciej Wos. It makes the definition of unfoldConvStream non-recursive.
It also adds a new recursive function `self', which won't receive a
Nullable dictionary as an argument.

I confirmed that this patch fixes Maciej's problem. Other functions
from the library may suffer from the same problem, but I haven't
tested yet. So this patch only modifies unfoldConvStream.

Regards,
Takano Akio
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