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

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

> +1 for low level system wrapper to get current stdout console size

So use os.get_terminal_size()

> -1 on COLUMN/ROWS "business logic"

So don't use shutil.get_terminal_size(), but it looks like their is a
use case for this feature.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue13609>
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