[issue4199] add shorthand global and nonlocal statements

[Amaury Forgeot d'Arc]

Amaury Forgeot d'Arc <amauryfa at gmail.com> added the comment:

- the add_ast_fields() function seems to be added by this patch, but it 
is already in svn.

- Are 1-tuple supported?

    t = [1]
    global a, = t

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nosy: +amaury.forgeotdarc

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