currently ignored by all

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

NOTE: very inefficient

Contains the following:
- annotation-aware codes-mapping API
- updated mapping tests
- updated codes-base models to use the new API
- updated LSM to configure based on annotation
  - fixed initialization issue (was doing config as an event)
  - no need for lsm_send_init from outside LPs

- 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.

- currently ugly-looking, might want to think of
  a better way to acheive this