This Fixes #935 : Showing list of users who starred the current notebook
This Fixes #935 : showinginfo icon against each notebook which displays the  list in a popover
Merge branch 'develop' into feature-935-showStarrerList
This fixes #935 : formatting

removed extra spaces
This Fixes #935 : Lazy loading & icon change
Merge branch 'develop' into feature-935-showStarrerList
This Fixes #935 : Lazy loading & icon change
Merge branch 'develop' into feature-935-showStarrerList
This Fixes #953 : formatting changes
Merge branch 'develop' into feature-935-showStarrerList
This fixes #935 : Using destroy instead of hide

Since the popover is to be destroyed after use, they have to be recreated on each click. So creating the popover in the click handler on info icon.
Merge branch 'develop' into pr/1098

Conflicts:
	htdocs/editor_tab.js
various tweaks to notebook info popover

for #1098
tighten up layout
restore the arrow
tooltip text
etc.