fix compatibility with py3

Author: oesteban

nipype/interfaces/fsl/epi.py

@@ -378,7 +378,7 @@ def _parse_inputs(self, skip=None):
         # If not defined, assume index are the first N entries in the
         # parameters file, for N input images.
         if not isdefined(self.inputs.in_index):
-            self.inputs.in_index = range(1, len(self.inputs.in_files) + 1)
+            self.inputs.in_index = list(range(1, len(self.inputs.in_files) + 1))
 
         return super(ApplyTOPUP, self)._parse_inputs(skip=skip)