Darshan 3x support

See merge request !42

Model net scheduler selection fix

See merge request !48

Analysis LP/Virtual Time Sampling

See merge request !50

Fix for incorrect busy time in the template code

See merge request codes/codes!43

Updating dragonfly-custom: support for df-dally vc counts, adding statistics for intra-group and inter-group traffic, introducing minimal bias and adaptive threshold

Report error when model-level sampling hasn't been implemented

See merge request !31

using nsecs instead of seconds when compute delay. This should give us an accurate measure of the compute time

If this looks correct, the fix will be extended to all models.

Change-Id: I74ecf2f5bd72962f4c3b8f1683b3929f4342dbf5

Template for new networks

See merge request codes/codes!38

notes:
- this generator will issue MPI-IO events, which cannot yet be handled
  directly by CODES simulations but are honored by the
  codes-workload-mpi-replay utility
- the codes-workload-mpi-replay utility now includes a --prep argument
  that will generate files that need to be read for subsequent replay