Adds plotSdD.py (incomplete)
Small changes in plotCorr.py and plotND.py

Open h5 files in 'r' mode
Change self.nd2ecSI to self.ND2ecSI
Fixes a small bug of sdD_err when numMD = 1 in fitSdDCesaro.py
Adds the default output name in the help description
Merge branch 'oct2py'
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.