(svn r3944) -Feature: it's now possible to turn a single unit in a train

	control-click on a unit in a train in a depot will make the click unit turn around
	this is useful if you want "normal" engines to act as dualheaded (one each way) or similar
	this only works on single unit units. Multiheaded and articulated engines get a red error box
	this is based on a quick hack peter1138 while I made it network safe and correctly handling of multible unit engines

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