Added an equality operator for Sample objects.
Added a printout of the success rate of generating new samples when generating a trace.
Merge branch 'success_rate'
Changed default settings print out to use "false" and "true" instead of 0 and 1 for clarity.
Updated the gaussian process emulator to optionally ignore the model uncertainties.
Added a setting PCA_USE_MODEL_ERROR to determine whether or not the gaussian process emulator should use the model errors.
Updated applications to respect PCA_USE_MODEL_ERROR setting.
Made sure that the dummy emulator has the same m_UseModelError flag for consistency.
Changed useModelUncertainty to useModelError for consistency with the setting name.
Fixed how m_UseModelError was passed on to the SingleModel.