Issue #1361218 by Owen Barton, Kevin Morse, Everett Zufelt: Fixed Focus jumps to tab when pressing enter on a form element within tab.

- Patch #376293 by casey, Dave Reid, droidenator, moshe weitzman: activate current vertical tab from URL fragment.

#467296 by Frank Ralf, mgifford, Everett Zufelt, Cliff,seutje, Bojhan, kat3_drx, et al: Accessibility improvements for vertical tabs.

- Patch #444344 by kkaefer, sun, Rob Loach: this change introduces a jQuery .once() method which streamlines the way behavior functions work. Previously, we had to manually ensure that an element is only initialized once. Usually, this happens by adding classes and selecting only those elements which do not have that class. However, this process can be separated out into a jQuery ‘filtering’ function which does all the grunt work.

#323112 follow-up by kkaefer: Make tab titles enclosed in <strong> tags to indicate importance from surrounding text.

#323112 by dmitrig01, kkaefer, quicksketch, frando and many many more: Now presenting... Vertical Tabs. Fantastic new UI improvement for node forms and hopefully more in the future.