Rename package from ui.headlessUI -> ui.headless

The second "UI" suffix was redundant.

Author: ctrueden

src/main/java/org/scijava/ui/DefaultUIService.java

@@ -62,7 +62,7 @@
 import org.scijava.ui.DialogPrompt.OptionType;
 import org.scijava.ui.DialogPrompt.Result;
 import org.scijava.ui.event.UIShownEvent;
-import org.scijava.ui.headlessUI.HeadlessUI;
+import org.scijava.ui.headless.HeadlessUI;
 import org.scijava.ui.viewer.DisplayViewer;
 
 /**

…rg/scijava/ui/headlessUI/HeadlessUI.java …/org/scijava/ui/headless/HeadlessUI.javasrc/main/java/org/scijava/ui/headlessUI/HeadlessUI.java renamed to src/main/java/org/scijava/ui/headless/HeadlessUI.java src/main/java/org/scijava/ui/headlessUI/HeadlessUI.java renamed to src/main/java/org/scijava/ui/headless/HeadlessUI.java

@@ -29,7 +29,7 @@
  * #L%
  */
 
-package org.scijava.ui.headlessUI;
+package org.scijava.ui.headless;
 
 import java.io.File;
 

src/test/java/org/scijava/ui/UIServiceTest.java

@@ -42,7 +42,7 @@
 import org.junit.Test;
 import org.scijava.Context;
 import org.scijava.display.Display;
-import org.scijava.ui.headlessUI.HeadlessUI;
+import org.scijava.ui.headless.HeadlessUI;
 import org.scijava.ui.viewer.DisplayWindow;
 
 /**