Error codes
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1) CTL4j applications

	*  1: Bad file encoding (has to be set to 'iso-8859')
	*  2: Environment variable CTL_LOC is not a valid location
	*  3: Object not found in internal map
	*  4: No suitable service was found by the resource manager
	*  5: Unsupported operation (e.g. DAT message during communication)
	*  6: Debugging requested for a non TCP connection

	* 10: Critical communication errors (e.g. socket was closed or a timeout)
	* 11: Header corruption detected (packet size >64MB)

	* 20: Could not create file or directory

2) CTL4j utilities

	*  1: No argument specified or arguments are invalid
	*  2: Class not found
	*  3: Error while reading from stdin
	*  4: Unsupported protocol
	*  5: No data was received

	* 10: Selected class belongs to no package (CodeGen.Main)
	* 11: Process could not be started (Debug.DummyDebugger)

3) Test programs

	All test programs return 1 when an error occurs.