Merge branch 'bf/shellgpusubmit' into 'master'

BF: Fix for gpu-submission when using the fsl_sub shell plugin

See merge request !20

xtract

@@ -521,7 +521,7 @@ chmod +x "$commands"
 if [ $gpu -eq 0 ]; then
   fsl_sub -T 2160 -n -l "$out/logs" -N xtract -t "$commands"
 else
-  fsl_sub -T 300 --coprocessor=cuda -l "$out/logs" -N xtract "$commands"
+  fsl_sub -T 300 --coprocessor=cuda -l "$out/logs" -N xtract sh "$commands"
 fi
 
 #EOF