Changes to use getKeyFromFitBoundary() in fitNDCesaro.py
Changes to use getKeyFromFitBoundary() in fitSdDCesaro.py ...

and changes zz to zzCross
Changes from saving 'std' 'err' with dict to saving '_std' '_err' directly ...

in fitNDCesaro.py.
plotND.py is modified accordingly.