Pre-PEP: Dictionary accumulator methods

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I am surprised nobody suggested we put those two methods into a
separate module (say dictutils or even UserDict) as functions:

from dictutils import tally, listappend

tally(mydict, key)
listappend(mydict, key, value)

I am -1 about a specific subclass of dict in the standard library, I
would not mind about a few new functions
in an utility module.

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