I believe the bug has been found that prevented modulation
from functioning.  It seems that setting --AO_sim via the commandline
and giving a bounds to save data (e.g. -s900 -e910, note these are arbitrary values)
caused the displacement and refractive values to not be computed for every time
step of the acoustic simulation, which means when the monte-carlo portion ran
it was seeing zero's until the displacement and refractive index was updated
over the interval specified (start and end times of recording data).  Now
when KSpaceSolver::StoreSensorData is called the values are computed, regardless,
at each time step and only recorded over the specified interval.

Committing this change to test on linux and verify that this indeed does solve
the problem.

To Do:
- Verify this change fixes the problem of the OPL not being changed by
  running a full simulation and computing delta speckle contrast.
- Run the same acousto-optic simulation, but load in the data from
  the previous run (i.e. run --AO_sim_loadData) and verify that the
  peak delta contrast in both cases matches.