[Etoys] [bug][fix]GraphMorph play

[Karl]

'Graph play' in Etoys did not work because there was no play method in 
GraphMorph. Fixed here.

Karl
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'From etoys2.1 of 8 August 2007 [latest update: #1664] on 20 September 2007 at 6:14:16 pm'!
"Change Set:		GraphMorphPlay
Date:			20 September 2007
Author:			Karl Ramberg

'Graph play' in Etoys did not work because there was no play method in GraphMorph. Fixed here. "!


!GraphMorph methodsFor: 'commands' stamp: 'kfr 9/20/2007 12:25'!
play
	self playOnce! !