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Integrating DUMPI's MPI trace replay with model-net. Currently, supports replaying MPI point-to-point messaging on top of torus/dragonfly and simple-net network models.

- NOTE: shim just forces packet size to a huge number

- NOTE: the current scheduling policy of FCFS is hard-coded, this will change
  in future revisions
- NOTE: random number generation has changed due to the differences in
  scheduling and packet ordering. Hence, results may be slightly different from
  runs prior to this commit

- just a copy of simplenet with variables and functions renamed for now

Adding dragonfly network model with codes, model-net-test case run time parameters are updated (see README_MN_TEST.txt for details)

Adding the torus network plugin with modelnet API, see model-net/README_MN_TEST.txt for instructions to run the test