Fix incorrect diagnostic message for CONFLICTING_OVERLOADS

- the member and the container were mixed up
- don't output "defined in" part of the message, because we tell later where
  it's already defined in
- fix an instability of the diagnostic order in OverloadResolver by using
  LinkedHashSet

core/descriptors/src/org/jetbrains/jet/renderer/DescriptorRenderer.java

@@ -60,6 +60,10 @@ public interface DescriptorRenderer extends Renderer<DeclarationDescriptor> {
 
     DescriptorRenderer DEBUG_TEXT = new DescriptorRendererBuilder().setDebugMode(true).build();
 
+    DescriptorRenderer HTML_COMPACT_WITH_MODIFIERS = new DescriptorRendererBuilder()
+            .setWithDefinedIn(false)
+            .setTextFormat(TextFormat.HTML).build();
+
     DescriptorRenderer HTML = new DescriptorRendererBuilder().setTextFormat(TextFormat.HTML).build();
 
     @NotNull