People: Enable split action bar on 1-pane

- Also fixes bug 5023543: (1pane) Search menu item will be gone forever
- Also removed onCreatePanelMenu() and onPreparePanel().  With the action
  bar, returning false from onCreateOptionsMenu() is enough to hide
  all menu itesm.
  HOWEVER, because of a bug in the action bar, we can't simply return
  false from it... I put workaround code which should be removed
  once the action bar bug is fixed.

Bug 4689447
Bug 5023543

Change-Id: I46c34df127fb777fc9019b99783377c2ee15f7d1
diff --git a/res/values/styles.xml b/res/values/styles.xml
index 01f0e62..8fdccfc 100644
--- a/res/values/styles.xml
+++ b/res/values/styles.xml
@@ -161,7 +161,7 @@
         <attr name="call_log_list_item_height" format="dimension" />
     </declare-styleable>
 
-    <style name="PeopleTheme" parent="android:Theme.Holo.Light">
+    <style name="PeopleTheme" parent="android:Theme.Holo.Light.SplitActionBarWhenNarrow">
         <item name="list_item_height">?android:attr/listPreferredItemHeight</item>
         <item name="activated_background">@drawable/list_item_activated_background</item>
         <item name="section_header_background">@drawable/list_title_holo</item>