Fix Bug 965501, use flex for moar header awesomeness
Tweaks and add Safari support for flex
Final tweaks to header layout
put the spinner back jack
Add white-space nowrap to bullet proof checkbox label
closes bugs #991990 & #991991 - url hash is consistent with ranges, ctrl toggles single lines properly

Spelling and doc fix
Merge flexbox use for search panel. Close #271.
Merge highlighting fixes. Fix bug 991991. Fix bug 991990. Close #274.
Whoops. Increment format version since espressive changed layout.html in the flexbox patch.