[Feature Request] miracl_connect_csd_tractography.sh - option for multi-shell response algorithm

Under line 221, I was wondering if there could be a possibility to allow for multi-shell response algorithm rather than the single-shell approach that is currently present and it could help better characterize fiber crossings

```
if [[ ! -f $wm_response ]]; then

dwi2response dhollander $dti $wm_response $gm_response $csf_response \
-mask $mask -fslgrad $bvec $bval \
> >(tee response.err) 2> >(tee response.out >&2)
```