db: add migration to solve date format inconsistency, ref #19716.
conclusions: use same format for add/edit conclusion, ref #19716.
comments: use the same date format as for conclusion, ref #19716.
user rights: hide expert names for unpriviledged users, ref #19718.
layout: remove leftcolumn div from zope layout, ref #19384.
progress: order regions using `order` field, ref #19719.
Merged master