Extend the present scheme for forward running loops over all time steps to backward running ones also.
Extend the present scheme for forward running loops over all time steps to backward running ones also.


git-svn-id: 31d9d2f6432a47c86a3640814024c107794ea77c@1012 0785d39b-7218-0410-832d-ea1e28bc413d

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