move PGP key to download link
Fix tooltip pager feature

Updates to tooltip.js for msg spec changes.
Update COPYING.txt

Don't exclude other projects

Added new line

Don't specify that the comment token in Javascript is different from Python.

Fix line break

Update 3-clause line
renamed:    COPYING.txt -> COPYING.rst
s/COPYING.txt/COPYING.rst
Merge pull request #5429 from jdfreder/tooltipcompleter

Fix open-in-pager from tooltip
Make sure `element` is correct in the context of displayed JS

closes #5293
fix typo in gh_api.get_pulls_list
address PR feedback
Merge pull request #5396 from ivanov/fix-5363

prevent saving of partially loaded notebooks
Merge pull request #5430 from jdfreder/elementappend

Make sure `element` is correct in the context of displayed JS
Merge pull request #5419 from minrk/responsive-prompts

move prompts from margin to main column on small screens
Merge Security Pull Request: security-doc

Document the notebook security and trust model.
update links in notebook help menu
Merge pull request #5426 from takluyver/i5348

Separate get_session_info between HistoryAccessor and HistoryManager
Merge pull request #5428 from jdfreder/copying

Update COPYING.txt
Document extraction of octave and R magics
Merge pull request #5433 from takluyver/export-octave-r-magics

Document extraction of octave and R magics
fix check for empty cells in rst template

used isspace before, which is wrong from empty strings
Update whatsnew (notebook tour)