App changes for handling profile DB split.

- Added a custom loader to load in the profile and contact list.
- Made the CursorLoader for ContactEntryListFragment and its
  subclasses pluggable, so the default one could substitute in
  the combined profile-and-contact list loader.
- The photo manager needs some awareness of the profile ID-space,
  since it's doing bulk photo queries using a custom selection.
- Adapted Isaac's change to the section indexer to handle the
  profile being out of consideration when doing the address book
  index query.
- Removed uses of the ALLOW_PROFILE param, since it no longer exists.

Bug 5204577
Bug 5136432
Bug 5140891

Change-Id: I676b4cdeabe87b1b585c6c8df2cde51605777106