Group editor: Handle rotation correctly

- Properly save/restore fragment state
- Don't close cursors loaded by cursor loader.
  They are retained through orientation changes.  Closing them manually
  causes accessing closed cursors after screen rotation.

Bug 5075387
Bug 5136936

Change-Id: I7722d90e5a5b52af1666a69bc56d1df27c4de2a0
3 files changed