place-children in area-container<%>
Called to place the children of a container. See Geometry Management for more information.
( -> list of list containing four exact integers in [0, 10000]
send an-area-container place-children info width height)
info : list of list containing two exact integers in [0, 10000] and two booleans
width : exact integer in [0, 10000]
height : exact integer in [0, 10000]