Test downstream projects

Store display outputs in history for `%notebook` magic #2126

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Run time

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Job	Run time
jupyter_client	5m 35s
ipywidgets	54s
ipyparallel	5m 35s
qtconsole	3m 13s
nbclient	2m 20s
jupyter_kernel_test	38s
spyder_kernels	0s
	18m 15s