LogMessage: reduce toString(), which is used by StderrLogService

StderrLogService uses LogMessage.toString() to print log messages.
Reduce the amount of information contained in LogMessage.toString(),
to make the console output easier to read.

Author: maarzt

src/main/java/org/scijava/log/LogMessage.java

@@ -129,20 +129,12 @@ public void attach(Object value) {
 
 	@Override
 	public String toString() {
-		return format(this);
-	}
-
-	// -- Utility methods --
-
-	public static String format(final LogMessage message) {
 		final StringWriter sw = new StringWriter();
 		final PrintWriter printer = new PrintWriter(sw);
-		printer.print("[" + message.time() + "] ");
-		printer.print("[" + LogLevel.prefix(message.level()) + "] ");
-		printer.print("[" + message.source() + "] ");
-		printer.println(message.text());
-		if (message.throwable() != null) {
-			message.throwable().printStackTrace(printer);
+		printer.print("[" + LogLevel.prefix(level()) + "] ");
+		printer.println(text());
+		if (throwable() != null) {
+			throwable().printStackTrace(printer);
 		}
 		return sw.toString();
 	}