Adds calNDCesaro.py which is the Python version of calNoAverageCesaro-ND.m
Adds fitNDCesaro.py (not complete yet)
Changes default outFilename to NDCesaro.h5 in calNDCesaro.py

and small modification
Implements more fitNDCesaro.py

Now fitNDCesaro.py can fit and output the ND results.
Plotting function is not implemented.
Probably will do it in another file, as well as the unit conversion.

Currently the units are in the GROMACS' units (ps and nm)
Makes ND_err, NDTotal_err be zero when numMD = 1
Adds plotND.py (incomplete)

Only reading h5 file part is finished.
A trivial change in fitNDCesaro.py

change from operator '+=' to '='
Adds averageCorr.py to average multiple correlation files
Adds plotCorr.py to plot a correlation file
Trivial change in calNDCesaro.py
Fixes some bugs in fitNDCesaro.py
Fixes some bugs in loadDict and Const in plotND.py
Adds calSdDCesaro.py and fitSdDCesaro.py
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.
Removes the check of NaN when sdCorr is averaged by rho

Let sdCorr be NaN rather than zero should be more informative
Fixes a COM calculation bug in spatialDecompose_mpi.f90

and makes some small improvements in codes.