#### clear displayed labels, vtx colors ####
-------------------------------------------
funct: "Clear All Annotation (left-click-CLR)"
  clear_annot
-------------------------------------------
funct: "Clear All VtxCol Paint (mid-clk-CLR)"
  clear_vtxcol_labels
-------------------------------------------
funct: "Clear Annot+VtxCol (shift-mid-clk-CLR)"
  clear_annot
  clear_vtxcol_labels
-------------------------------------------
funct: "Clear One Label (ctrl-left-click-CLR)"
  set label <infile>
  read_label_to_clear_annot
-------------------------------------------
funct: "Clear One Color (ctrl-mid-click-CLR)"
  clear_annot_with_col <r> <g> <b>
-------------------------------------------


Detailed Description of Label "CLR" Button Actions

-------------------------------------------
funct: "Clear All Annotation (left-click-CLR)"
  clear_annot -- clear labels
-------------------------------------------

Clear all displayed annotation labels (labels
read into .annot field) from brain.  Any vertex
data previously partially occluded by the
annotation label(s) will now be fully visible.

If an MGH annotation file has been loaded, this
also clear the color LUT that maps annotation
label color to brain structure.

Finally, the .annotbord field is also cleared,
which will clear dot borders (if any are
displayed).

Note that if vertex data associated with a label
has instead, or in addition, been read into the
val field (using the "R" button -- function:
read_label_to_val), *that* data will *not* be
cleared.  Use the "CLR" button on the "val:" line
to clear vertex data.

-------------------------------------------
funct: "Clear All VtxCol Paint (mid-clk-CLR)"
  clear_vtxcol_labels
-------------------------------------------

Clear all vertex-color labels from brain.  Any
vertex data previously occluded by the
vertex-color label will now be visible.  This
won't affect labels displayed using "D" or any
vertex data loaded with "R".


-------------------------------------------
funct: "Clear Annot+VtxCol (shift-mid-clk-CLR)"
  clear_annot
  clear_vtxcol_labels
-------------------------------------------

Clear both annotation labels and all vertex-color
labels, too.

-------------------------------------------
funct: "Clear One Label (ctrl-left-click-CLR)"
  set label <infile>
  read_label_to_clear_annot
-------------------------------------------

Clear displayed annotation only under label
currently in "label:" line entry.

-------------------------------------------
funct: "Clear One Color (ctrl-mid-click-CLR)"
  clear_annot_with_col <r> <g> <b>
-------------------------------------------

Clear displayed annotation with color specified
by r,g,b fields to right of MESH button.  Load
the color by first clicking an annotation region.

