Merge branch 'develop' into 'master'

Documentation/Concept.rst

Documentation/Report.rst

Documentation/index.rst

extension/Classes/Core/AbstractBuildForm.php

extension/Classes/Core/Constants.php

extension/Classes/Core/Database/Database.php

extension/Classes/Core/Helper/KeyValueStringParser.php

extension/Classes/Core/Helper/OnArray.php

extension/Classes/Core/Helper/OnString.php

extension/Classes/Core/Helper/Support.php

extension/Classes/Core/QuickFormQuery.php

extension/Classes/Core/Report/Download.php

extension/Classes/Core/Report/Link.php

extension/Classes/Core/Report/Report.php

extension/Configuration/TCA/tt_content.php

extension/Resources/Private/Report/formEditor.qfqr

extension/ext_conf_template.txt

javascript/src/TablesorterController.js