ENH: tests for multi-shell dtifit to the diffusion MRI data

Tests both kurtosis flags (also --wls with --kurt flag)

diffusion_multishell/feedsInputs

+diffusion_multishell

diffusion_multishell/feedsRun.kurt

+#!/usr/bin/env sh
+
+# Runs dtifit with the --kurt flag on the multi-shell diffusion data
+
+outdir=$1
+datadir=$2/diffusion_multishell
+
+dtifit -k ${datadir}/data.nii.gz -b ${datadir}/bvals -r ${datadir}/bvecs -m ${datadir}/nodif_brain_mask -o ${outdir}/kurt --kurt
+dtifit -k ${datadir}/data.nii.gz -b ${datadir}/bvals -r ${datadir}/bvecs -m ${datadir}/nodif_brain_mask -o ${outdir}/kurt_wls --kurt --wls

diffusion_multishell/feedsRun.kurtdir

+#!/usr/bin/env sh
+
+# Runs dtifit with the --kurt flag on the multi-shell diffusion data
+
+outdir=$1
+datadir=$2/diffusion_multishell
+
+dtifit -k ${datadir}/data.nii.gz -b ${datadir}/bvals -r ${datadir}/bvecs -m ${datadir}/nodif_brain_mask -o ${outdir}/kurtdir --kurtdir