MNT: Run GPU jobs via fsl_sub, so they can be run locally or on the cluster

gpu_test/btest/feedsRun

@@ -8,4 +8,9 @@ indir=$(pwd)
 pushd $outdir
 cp -r $indir/bedpost .
 
-bedpostx_gpu bedpost
+job_id=$(fsl_sub --coprocessor=cuda bedpostx_gpu bedpost)
+touch ${outdir}/wait
+fsl_sub --jobhold ${job_id} rm wait
+while [ -e ${outdir}/wait ]; do
+  sleep 1m
+done