Pick from aggregate contacts when adding to a group (1/2)

* Searching for new group members happens on the standard
  contact seletion activity now so we remove the separate
  search menu item and the old SuggestedMemberListAdapter
  used by the autocomplete text view.
* When a new group member is selected, we add all the raw
  contacts in the selected contact that are owned by the
  group account owner to the group.
* Also use the same unknown name string "(No name)" on the
  the new group member picker that is used on the other
  contact lists.

Bug 28720761
Bug 28716004
Bug 28707265
Bug 18641067

Change-Id: I152bf1caf6652aa474f8f2915248ee19fb5fccf8