only show simple relative inclusions in forms+example

This ticket was originally about CSS (see italicized text below).  I'm proposing we solve that problem and others by having forms only handling inclusions beginning with "+".

If you look at the HTML of http://test.dwagn.org/new/type_with_simple_inclusion_in_form you'll see that the simple included card "Menu" has the CSS class "RIGHT-menu".

Should be "SELF-menu", yes?