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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

so people can bring their own workload

- only activated if Darshan enabled at configure time
- currently fails with assertion

currently ignored by all

- fix noop workload ops
- get rid of unused workload option

- Replay tool no longer offers bglockless prefix (ignored for POSIX
calls).
- Print workload load time on rank 0
- convert sleep functionality to use more accurate nanosleep

Hack to force replay tool to use one preallocated and initialized
I/O buffer for all I/O operations. Malloc'ing a new
(uninitialized) buffer for each I/O operation causes really poor
performance, likely due to page faults.

Darshan generates longer delays, and mpi replay tool now can be
configured to play a percentage of the overall delay.

Darshan and recorder workloads have temporary debug parameters that
are no longer used and can be removed.

The codes-workload-test and codes-workload-mpi-replay both support
the new paramters of the bgp-io language workload generator. Also,
support has been added to the config file and codes-workload-mpi-replay
program for loading the parameters of a darshan config file.

Improve the performance of the darshan i/o workload by converting the
linked list of per-rank contexts to a hash table.

Update the output directory argument of the mpi-replay tool to just
specify an already existing directory to perform the workload I/O in.

Modify the mpi-replay tool (located at tests/workload) to spit out
verbose information on each event it replays, if user specifies
-v option. Also, modify the mpi-replay tool to perform no-ops for
each replayed event, if user specifies --noop option. The replay
tool should function properly for all workload types now.

TODO: The tool should offer functionality for initializing the context
of the output replay directory. That is, the tool should first scan
the given workload and create all files and preallocate space for all
I/O ops in the workload. Currently, the replay tool will fail on any
files that are not explicitly created by the workload.

adding the mpi-replay tool to the tests/workload directory for replaying workloads from the codes workload api