removed the deprecated boundary_condition_to_string() function
the name of did_nn_bcs_theory has been changed.

this fixes a regression.
created wfa->is_nonzero() method
OperatorMeasurement in python is now more appropriately known as BasicOperatorMeasurement
made docstring more accurate
keep a registry of all the MeasurementPlan's
wrapped RunInformation
moved Estimate wrapping to its own file
Estimate objects in python
public get_binlevel_data() function
log resource usage
log the run information
added a note, fixed spacing
s/MeasurementPlan/BasicMeasurementPlan/; s/BaseMeasurementPlan/MeasurementPlan/; introduced CompositeMeasurementPlan
test that the rng has not already been used
when calling create_wfa(), use the actual RNG that was passed to the function
we can now pass an RNG to MetropolisSimulation
we now pass a WalkPlan to MetropolisSimulation's constructor, not the actual Walk
refactoring scan.py (still in progress)
removed old, unused corr.py for calculating correlators