#1207680 by damz: Don't validate if there are no options set, the values are empty and required is not set

#1189926 by dereine: Allow string filters exposed required setting to be configurable and default to FALSE

Issue #470258 by joachim after more than a year of work: Groupwise representative relationships. Or subquery relationships.

#1147326 by becw, dereine: Add a way to reverse transforming of argument values back to the original value, so you can use it for the summary. For example you can have now user: uid as argument but still have nice username urls.

Issue #1182762 by tim.plunkett: Remove periods in sentences on checkbox titles, as they are counter to UX standard.

#1167562 by dereine: Fix index for the format key and take sure that there is always an format given to check_markup

#1034532 by damz, dereine: Always export filter formats for text area and exposed input required plugin

#1130760 by neoglez: Don't call get_render_tokens for a row if you don't have the row context, but the style context

#1118570 by dereine: Remove extra id for the replacement pattern so global custom field/global math field are shown always