Fix fine tuning arguments order

Previously the argument were given in a wrong order.

Author: MartinGrignard

nipype/interfaces/meshfix.py

@@ -101,23 +101,27 @@ class MeshFixInputSpec(CommandLineInputSpec):
 
     finetuning_inwards = traits.Bool(
         argstr='--fineTuneIn ',
-        requires=['finetuning_distance', 'finetuning_substeps'])
+        requires=['finetuning_distance', 'finetuning_substeps'],
+        position=-3
+    )
     finetuning_outwards = traits.Bool(
         argstr='--fineTuneOut ',
         requires=['finetuning_distance', 'finetuning_substeps'],
+        position=-3,
         xor=['finetuning_inwards'],
-        desc=
-        'Similar to finetuning_inwards, but ensures minimal distance in the other direction'
+        desc='Similar to finetuning_inwards, but ensures minimal distance in the other direction'
     )
     finetuning_distance = traits.Float(
         argstr='%f',
         requires=['finetuning_substeps'],
+        position=-2,
         desc="Used to fine-tune the minimal distance between surfaces."
         "A minimal distance d is ensured, and reached in n substeps. When using the surfaces for subsequent volume meshing by gmsh, this step prevent too flat tetrahedra2)"
     )
     finetuning_substeps = traits.Int(
         argstr='%d',
         requires=['finetuning_distance'],
+        position=-1,
         desc="Used to fine-tune the minimal distance between surfaces."
         "A minimal distance d is ensured, and reached in n substeps. When using the surfaces for subsequent volume meshing by gmsh, this step prevent too flat tetrahedra2)"
     )