Revert "Issue #1742438 by larowlan, Christian Biggins, kim.pepper, dcam, Everett Zufelt, mgifford: Fixed Vertical tabs header and container rendered even when no vertical tabs."

Concerns raised in http://drupal.org/node/1742438#comment-6609888 that this breaks backwards compatibility.

This reverts commit d462cafd.

Issue #1622974 by xjm, iflista, brianV: Fixed Aggregator fails to parse author entries longer than 255 characters.

Issue #1742602 by dcam, Lars Toomre, xjm, lazysoundsystem: Remove t() from assert messages in comment module tests

Issue #1742438 by larowlan, Christian Biggins, kim.pepper, dcam, Everett Zufelt, mgifford: Fixed Vertical tabs header and container rendered even when no vertical tabs.

Issue #218004 by Dave Reid, heyrocker, pcambra, neclimdul, alex_b, cam8001, twistor, mfb, catch, xjm, beeradb: Fixed Allow aggregator feed URLs longer than 255 characters.

Issue #1677830 by slashrsm: Improve docs for user and node hooks in regards to database transactions

Issue #1067120 by BTMash, DamienMcKenna, corvus_ch, valthebald, mrfelton, fgm, Dave Reid: Fixed Missing hook_taxonomy_term_view() or hook_entity_view() when viewing a term.

Issue #1038932 by tim.plunkett, Chris Gillis: Theme_image_formatter() assumes that title, alt, and options are always set.

Issue #1780012 by dewens: Fixed "parameter 1 expected to be a reference" error in Profile module's hook_user_cancel() implementation.

Issue #1037632 by Sheldon Rampton, Tor Arne Thune, roy smith: Fixed Attaching a forbidden file to a node gives an error message with bogus file path.

Issue #1057912 by bfroehle, mgifford, bowersox, tarekdj, geerlingguy, hgurol: Fixed Weird Border on Vertical Tabs with Google Chrome and Safari caused by .element-invisible.

Issue #1802844 by antojose: Fixed 'have to' repeated twice as 'have to have to' in the comment for the function hook_module_implements_alter() in system.api.php.

Issue #1154382 by Berdir, barraponto, acouch, swentel, LoMo, DamienMcKenna, chx: Fixed View mode no longer can be changed.

Issue #1410260 by swentel, mojzis, droplet, pingers, drupdan3: Fixed rss.xml/whatever triggers PHP error.

Issue #1785392 by BWPanda: Fix reference and grammar in hook_field_formatter_info_alter documentation

Issue #1773032 by Jorrit: Fixed Non-standard and pointless name attribute added to Content-Type header.

Issue #1397882 by sun, kbasarab, catch, pingers: Fixed system_theme_settings_submit() does not properly clean up submitted form values.

Issue #1739808 by Berdir, salvis | GrzegorzNowak: Fixed Notice: Undefined index: file in DatabaseLog->findCaller().

Roll back issue #948516 from Drupal 7 for now (which made down arrows in fieldsets part of the link) because it breaks RTL languages.