[issue11734] Add half-float (16-bit) support to struct module

[Raymond Hettinger]

Raymond Hettinger added the comment:

In the docs for note 7, consider expanding the text to describe what a half-float is (1-bit sign, 10 bit significand, 5 bit exponent) and its allowable range.  This wasn't necessary for codes "f" and "d" since they have well-known C equivalents, but in this case some elaboration is needed.  Also consider  including a link to the wikipedia article and perhaps to IEEE 754-2008.

Otherwise, he patch looks complete and passes the test suite.  I think it is ready to apply.

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nosy: +rhettinger

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