CalcSymmetry.m
Compute a measure of symmetry for every columns of a given data matrix, when a list of
pairs of channels is provided
Depending on "NormFlag", this measure is either the sum of differences of absolute values at
corresponding electrodes divided by norm of the data vector ('abs'), or the sum of differences of
the values at the corresponding electrodes, divided by the norm of the data vector ('sign'), or
the sum of differences of the values at the corresponding electrodes, each divided by the sum
of the absolute values at the corresponding electrodes ('lat' => lateralization index)
OH 27.11.97, 14.12.97, MJ 31.03.98