Always include label for all form widgets
For now we must put a
<label/> tag for many widget otherwise they do not have one shown. This makes extension sometimes complex because we can break the alignment on a single line between the label and the field.
I think we should allow to create form for which each field will always have a label in the same cell.
As it would be a major change and because we may want to have the current design for some views, we should have an option on the
<form/> to display or not label inside the field.
On tryton, we could use a Gtk.Frame with the field label as label. And for checkbox we just use a Gtk.HBox with the label next to the checkbox.