Jupyter-o2

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Fixed
^^^^^
- Increased login timeout from 10 seconds to 60 seconds
to reduce timeout errors

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Added
^^^^^
- Option to use SSH public key authentication 14
- Better warning messages for X11 DISPLAY error 15

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Added
^^^^^
- Check for available updates 13

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Added
^^^^^
- Fix segmentation fault on ``import Quartz``
- Fix ``try_quit_xquartz()`` in recent versions of macOS (Use the config option ``KEEP_XQUARTZ`` if quitting XQuartz is not desired.)
- Remove check for root prompt at ``login()``

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Jupyter-O2 detects and responds to Duo two-factor authentication
prompts automatically, requesting a Duo push by default.
This means that the arguments ``--2fa --2fa-code 1`` are no longer
required to use two-factor authentication; ``--2fa`` now has no effect.

Added
^^^^^
- Automatic detection and handling of 2FA prompts 10
- More error messages in case of job submission errors 11
- Interactive mode for responding to 2FA prompt 2

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Added
^^^^^

- Better error message if two-factor authentication fails
- Warning if two-factor authentication is set incorrectly
for the computer's network location