Update Part 6 - Custom Widget.ipynb

changed the path to :  widgets/js/widget
Update File Upload Widget.ipynb
Update File Upload Widget.ipynb
Fixing the rest of the widget paths (widgets/js).
debug occasional error in test_queue_status

this shouldn't actually fix the bug, just provide more information the next time it fails.
Merge pull request #5289 from ellisonbg/widget-path

Finishing up #5274 (widget paths fixes)
Merge pull request #5291 from minrk/debug-queue-status

debug occasional error in test_queue_status
focus next cell on shift+enter
Merge pull request #5292 from jdfreder/shift-enter-scroll

focus next cell on shift+enter
2.0.0 beta 1
setup jsversion
Fix NameError: name '_rl' is not defined
Merge pull request #5300 from cgohlke/patch-1

Fix NameError: name '_rl' is not defined
back to dev
Fix local import of select_figure_formats.

Fixes issue with setting InlineBackend.figure_format config value,
reported on mailing list.
Merge pull request #5318 from takluyver/selfigform-import

Fix local import of select_figure_formats