dform miniMenu could take a "submit" property

[smithfarm]

Some dforms may not need a miniMenu at all. If the miniMenu object contains a lone "submit" property, only a submit button is displayed and hitting enter on the last entry will also cause the form to be submitted. The value of the "submit" property would be interpreted as a target to pull and start. E.g.:

target.push('formFoo', {
    'name': 'formFoo',
    'type': 'dform',
    ...
    'miniMenu': {
        'submit': 'fooAction'
    }
});