Add a FlowControl element within a Questionnaire

[ThomasPO]

We want to use the FlowControl element in two ways:

• as a GoTo only used in a question
• as a Filtrer only used in the questionnaire

We prefer describing a Filter at the same level of the other components, i.e in the Questionnaire.

It could mean adding something like that in the Questionnaire:
<xs:element name="FlowControl" type="FlowControlType" minOccurs="0" maxOccurs="unbounded"/>