ADC Moco Deformation Fields

[alexdaniel654]

Because the ADC motion correction is done in two steps (fitting to a constant model within b-values, take the mean of each b-value and then fit to an ADC model across b-values) the deformation field comes in two parts, a within b-value deformation field for every volume input to the ADC class and a across b-value deformation field for each b-value. Outputting an array of the total deformation experienced by each volume i.e. the combination of the two deformation fields, would be useful.