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Morph program interface

Making one morph a submorph of another: 
	ownerMorph addMorph: subMorph
Removing a submorph from its owner: 
	morph delete
	ownerMorph removeMorph: subMorph
Other useful messages to morphs: 
	owner
	morphs, morphCount, morphsDo:
	allMorphsDo:
	isInWorld, world
	copy, copyRemoveAllMorphs

Programmatic manipulation of morphs

A morph can be made a submorph of some other morph using the addMorph: operation. This operation updates both the owner slot of the submorph and the submorphs list of the owner to reflect the desired configuration. For example, adding morph B to morph A adds B to A submorph list, removes B from its old owner (if any), and sets B's owner to A. The addMorph: operation also updates the layout of both B's old and new owners. The global position of a morph is held invariant by addMorph: (although some morphs may perform an automatic layout as a side-effect of addMorph:, immediately changing the position of the newly- added morph.).

Here are some other useful messages to morphs: 

owner			"a morph's owner"
morphs			"a copy of the morphs submorph list"
morphCount		"the number of submorphs"
morphsDo: aBlock	"iterate over the direct submorphs"
allMorphsDo: aBlock	"iterate over the morph and all its submorphs"

delete			"remove the morph from its owner"
removeMorph: m		"remove the submorph m"
isInWorld		"is the morph in a world?"
world			"the morph's world (must be in a world)"

copy			"copy the morph and its submorphs"
copyRemoveAllMorphs	"copy the morph without its submorphs"

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