fixed: if form using same Itemid as its list, and containing dbjoin element with "front end select" option", then potentially no columns were shown as the "show in list" element ids were taken from the forms lists menu item parameters
fixed: issues with autocomplete dbjoin and select in front end not
working. Also add record from popup window would possibly display "could
not find row" error message, as the URL to load the form was not correct
(back ported change I had already made in 3.1 into 3.0 for this one)'