Only print compiler messages if --verbose flag is given.

ragconnect.base/src/main/java/org/jastadd/ragconnect/compiler/Compiler.java

@@ -138,7 +138,9 @@ public class Compiler extends AbstractCompiler {
   }
 
   private void printMessage(String message) {
-    System.out.println(message);
+    if (optionVerbose.value()) {
+      System.out.println(message);
+    }
   }
 
   private void writeToFile(Path path, String str) throws CompilerException {