Mnt/chris rorden gpu test

Handy sanity check tests for eddy_cuda, bedpostx_gpu and probtrackx2_gpu, developed by Chris Rorden: https://github.com/neurolabusc/gpu_test/

The eddy test calls $FSLDIR/bin/eddy, so requires FSL 6.0.6 or newer (not yet released)

gpu_test/btest/feedsRun

+#!/usr/bin/env bash
+
+set -e
+
+outdir=$1
+indir=$(pwd)
+
+pushd $outdir
+
+bedpostx_gpu $indir/bedpost
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