[issue13609] Add "os.get_terminal_size()" function

[Zbyszek Szmek]

Zbyszek Szmek <zbyszek at in.waw.pl> added the comment:

> the Python script is executed. Will get_terminal_size()
 > return new value?
Please see previous discussion and the docs (and the SUSv2 specs).
The env. var. is for overriding.

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<http://bugs.python.org/issue13609>
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