Minor This must allow to have nodes where n tasks are created and assigned and the node will be resumed when all the tasks are ended.
Add a new property on the node object that makes it an n task node. This property is useful only for nodes who create tasks. When the workflow engine evaluates a node with this property set to true, each assignee of the list of assignees (without resolving groups) will be assigned its own task.
When this property is set to true, the form presented to the user should be presented in read-onbly (actually, we will want to show the comment, but I'll create another ticket for this as it is a wider topic).
Buttons clicked by users should be added in a collection (and in the future the comment too), so that it is possible in mvel to know how many clicked on "this button", or "this button" (syntax to be completed)
