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
3 files changed