Fix for JDatabaseQuery->union method.  See #32995.
Also minor corrections and improvements to docblocks for union methods.
Removed redundant union clear test.  Added union object test.
Corrected test and added two more.
Removed two redundent tests.  Updated copyright date.
Making link clickable for Twofactor Auth

See: http://joomlacode.org/gf/project/joomla/tracker/?action=TrackerItemEdit&tracker_item_id=32632&start=0
Updating isis/css/template-rtl.css from .less files
[#32225] JToolbar Button name translated when it should not be. (Fix
#2189)
Merge pull request #3067 from Hackwar/patch-5

Making link clickable for Twofactor Auth
[#33440] Updating FOF to version 2.2.0. (Fix #3260)
Merge remote-tracking branch 'origin/staging' into staging
Merge pull request #3272 from Harmageddon/generatecss

Updating isis/css/template-rtl.css from .less files
Merge pull request #2735 from chrisdavenport/db-union-fix

Fix for JDatabaseQuery->union method.  See #32995.
Merge remote-tracking branch 'joomla/staging' into 3.3-dev