create an error type for when the server kills the render (before it was part of NOOUTPUTFILE)

src/com/sheepit/client/Client.java

@@ -497,7 +497,7 @@ public class Client {
 			// no exception should be raised to actual launcher (applet or standalone)
 		}
 		
-		if (error != null && (error == Error.Type.RENDERER_CRASHED || error == Error.Type.RENDERER_KILLED_BY_USER)) {
+		if (error != null && (error == Error.Type.RENDERER_CRASHED || error == Error.Type.RENDERER_KILLED_BY_USER || error == Error.Type.RENDERER_KILLED_BY_SERVER)) {
 			// do nothing, we can ask for a job right away
 		}
 		else {