subquestions li, with list-style: none and margin-left: 10px
Rewrite questionnaireController::editAction; remodel form/question (wip)

* make basic form class questionnaireNode and subclass it for question,
group, text, likert (in progress)
files: form/question -> form/QuestionnaireNode
* adjust editQuestion, to generate the right form (based on answerdomain-
type) at the right times (in progress)