Fix deque iteration.
Fix deque iteration.

Deques do not necessarily maintain the l.t. ordering that (e.g.)
vectors do.

git-svn-id: 83c4c97093aeea62ac982fbfd516bf9db27f5c99@1388 c36c8488-0289-0348-9b64-b301f74bd9a7

BlueBrain/Tuvok,BlueBrain/Tuvok,BlueBrain/Tuvok