Short: Centres the frontmost screen. V1.07

CenterScreen	A commodity which centers the frontmost screen horizontally
		on hotkey.  Useful if you normally operate with overscan
		screens and an old program opens a normal size screen.
		Requires at least AmigaOS 2.04.  Version 1.07, an update to
		version 1.03 on disk 497.  Includes german version and source
		in C.
		Author:  Stefan Sticht