Fixing two problems pointed out by Jed Brown:
1. Remove a couple of commented out lines of code.

2. Updating external/elemental to point latest
      The previous commits only worked for external Elemtantal
      builds -- this updates the submodule external to point to
        98f92cb9d19f5adb4d0da0150f76547280e4bb7c
      of Elemental.  This should be redone once Elemental 0.83 is out.