[issue3132] implement PEP 3118 struct changes

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

> Actually, this may be a requirement of #2394; PEP 3118 states that
> memoryview.tolist would use the struct module to do the unpacking.

:-(
However, we don't have any examples of the buffer API / memoryview
object working with something else than 1-dimensional contiguous char
arrays (e.g. bytearray). Therefore, I suggest that Python 3.0 provide
official support only for 1-dimensional contiguous char arrays. Then
tolist() will be easy to implement even without using the struct module
(just a list of integers, if I understand the functionality).

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