experimental : see commit info for details

- added controller->qtaskcontainer communication
- restored recursive task deletion for model coherency, let the segfault hunt
  begin!
- split method QTaskContainer::addTask in two, newTask (creates new root task)
  and addTask (adds a root task previously created by the controller)
- added a textChanged() signal to qlabeledit (careful, may be emitted twice
  when Return is pressed)

left to do:
- rename task from qtask
- find out where the segfault comes from
- remove QTaskContainer::newTask(), the controller should create the task
  instead
added pesitance ? Bug with tiny xml when the xml file is empty (maybe when there's no xml file too)
Changed signal
merged from branch master
woops, compiles now
Added some traduction
Added support for english in the making of a nouvelle task
fixed mege
fixes maybe ?
Added some trans
merge should be ok