Enable system-wide installations of Jupyter possible at any path #139
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Extend the config paths with additional system paths from environment variable JUPYTER_CONFIG_PATH.
Motivation:
Currently Jupyter configurations are only searched at fixed system paths (sys.prefix/etc/jupyter, ...)
and jupyter_config_dir(), which is in the first place a config dir writable to the user.
For a system-wide installation of Jupyter, which is not installed at sys.prefix one needs to have the ability to add additional system config paths.