Hopefully a fix for grouping calculations, when the grouped element is a
join.  Need to key the grouped calculations by value, not label.
Small change to element backend form, so it doesn't try and two column
the main details, which looks like doggie doo in 3.2 if you have WYSIWYG
labels enabled.
Merge branch 'joomla3' of git://github.com/Fabrik/fabrik into joomla3