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.
Invalid attribute width inside <tr> and additionally obsolete attributes

An invalid attribute within <tr> was found. In addition, I removed several attributes which its use is discouraged in HTML5.
Corrected test and added two more.
Removed two redundent tests.  Updated copyright date.
First draft of adding event to allow dynamic commercial updates and
installs
Simplified version, always fire onInstallerBeforeDownloadPackage event
before downloading a package
Even simpler, removed unused params
Restored mistakenly removed comments from original Joomla! code
Merge branch 'staging' into auth_update
Query-fix in com_content article modal

This change prevents the query from being executed when the value is 0. There is never an article with ID 0 and especially when there are more than one modal select per page, you have several unnecessary queries.
Install files
Update files
Merge remote-tracking branch 'joomla-cms/staging' into auth_update
Allow custom containers for Boostrap tooltips and popovers.
Simplified.
Changed tabs to spaces.
[Code Style] DocBlock and comment fixes and improvements.
Don't include sample images in update packages
Merge pull request #3001 from bembelimen/patch-6
Update checkboxes.php