Adds Hi-C matrices of the same size. Format has to be hdf5 or npz

usage: hicSumMatrices [-h] --matrices .h5 file format [.h5 file format ...]
                      --outFileName OUTFILENAME [--version]
optional arguments
--matrices, -m matrices to add. Must have the same shape.
--outFileName, -o
 File name to save the resulting matrix. The output is also a .h5 file. But don’t add the suffix
--version show program’s version number and exit