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variable: $normdsampsearchflag -- toggle norm search
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default: 0

"NormSamp, Clust Controls" parameter.  To adjust,
access pop-up by L-click on "label:" (bold).

This flag affects the operation of the following
functions:

  write_label_timecourses_stats
  ("label:" line "T" and "S" buttons)

  paint_surface
  ("val3d:" line "PAINT" button)

  find_orig_vertex_coordinates
  (upper right SEND button)

  write_val_visible_vertices
  (left-clk "W" button on "label:" line)

If not ticked, data is sampled at vertex.  All
following tickboxes and entries for adjusting the
search along the normal will have no effect.

If ticked, a search along the vertex normal is
performed.  If $normdsamp and $normdmax (or
$normdfracsamp and $normdfracmax) are both 0.0,
this is equivalent to no norm search.
