Rename chapter 6.
Update titles and schema labels.
New tikz commands!
Apply some feedbacks after the meeting.
Add the tikzannotate environment.
s/tikzannotate/tikzannotation/ and polish \circled
Add a wavy arrow and some tikz styles.
Add schemas.
Add a figure about the RAC.
Update the figure of atoum.
Add a new figure to illustate the extension.
Polish.
Update \tikzref and allow to shift a tikzbox.
Polish and add new figures.