TEST: Add FSL-course-based tests for siena/sienax

fsl_course/segmentation/siena/feedsInputs

+fsl_course_data/seg_struc/siena

fsl_course/segmentation/siena/feedsRun.siena

+#!/usr/bin/env bash
+
+outdir=$1
+datadir=$2
+
+cd $outdir
+cp $datadir/sub3m0.nii.gz  .
+cp $datadir/sub3m24.nii.gz .
+
+siena sub3m0 sub3m24 -d -m -b -30 

fsl_course/segmentation/siena/feedsRun.sienax

+#!/usr/bin/env bash
+
+outdir=$1
+datadir=$2
+
+cd $outdir
+cp $datadir/sub3m0.nii.gz .
+
+sienax sub3m0 -d -b -30 -r