Note: 
    Notice that this function doesn't fit in with newt's normal naming
    convention. It is an older interface which will not work for all forms. It
    was left in newt only for legacy applications. It is a simpler interface
    than the new newt_form_run() though, and is still used quite often as a
    result. When an application is done with a form, it destroys the form and
    all of the components the form contains.