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funct (left-click): mv vtxs along normal, mm
  norm_move_vertices <mm>
-------------------------------------------
funct (mid-click): mv vtxs along normal, fraction
  norm_move_vertices_fracthick <frac>
-------------------------------------------


Detailed Description of "N" Button Actions

-------------------------------------------
funct (left-click): mv vtxs along normal, mm
  norm_move_vertices <mm>
-------------------------------------------

Moves each vertex along the vertex normal a given
distance in mm using the value in the adjoining
entry (pos=outward, neg=inward).

There is no surface self-intersection constraint,
so large moves may fold the surface.


-------------------------------------------
funct (mid-click): mv vtxs along normal, fraction
  norm_move_vertices_fracthick <frac>
-------------------------------------------

Moves each vertex along the vertex normal a given
fraction of cortical thickness at that vertex
(pos=outward, neg=inward).

No self-intersection contraint.
