A LayoutPolicy defines how submorphs of some morph should be arranged. Subclasses of the receiver define concrete layout policies.

	testing
	isProportionalLayout isTableLayout

	utilities
	indexForInserting:at:in:

	layout	top
	flushLayoutCache Flush any cached information associated with the receiver
	layout:in: Compute the layout for the given morph based on the new bounds
	minExtentOf:in: Return the minimal size aMorph's children would require given the new bounds

	testing	top
	isProportionalLayout
	isTableLayout

	utilities	top
	indexForInserting:at:in: Return the insertion index based on the layout strategy defined for some morph. Used for drop insertion.