Argcomplete

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- Call \_default as fallback in zsh global completion hook

- Begin support for mapping-emitting completers

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- activate-global-python-argcomplete: do not overwrite existing dotfile
in user directory

- Add NOTICE file

- Establish long term name for split_line as
argcomplete.lexers.split_line

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- Re-add split_line to API (419)

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Fix zsh default completion issues

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- Fix zsh autoload issues

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- Fully support zsh. Argcomplete now supports completion descriptions
and global completion in zsh.

- Clean up top level namespace.

- Documentation and test improvements.