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toggle val type: "val:" vs. "val3d:"
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keyboard equiv: <none>

This label/entry has two different states, "val:"
(real or complex-valued surface vertex list
stats), and "val3d:" (real or complex-valued
native resolution 3D stat files).

On startup, the default state is "val:", which is
used to (re-)read ("R" button) vertex list wfiles
(usu. generated by PAINT) onto the surface.

Clicking on the label "val:" (bold to indicate it
is button-like) swaps in the "val3d:" entry,
which is used to load ("R" button) 3D stat files
(float BRIK's or *.bfloat sets).  These files
won't be visible until they have been sampled to
the surface with "PAINT" (only visible when label
is "val3d:").

Clicking again toggles the entry back to "val:"
