-------------------------------------------
left-click: toggle val type: "val:" vs. "val3d:"
mid-click: if "val:", get valfile output type popup
-------------------------------------------

Left-click "val:" or "val3d:"

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.

Left-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 on the "val3d:" label again toggles the
entry back to the original "val:" state.

Middle-click "val:"

A middle-click on the "val:" makes a popup for
controlling the valfile type written when "W" on
the "val:" line is clicked.

The $allverticesflag tick (default=OFF) controls
whether vertices only with non-zero vals are
written or all vertices are written.

The $val2newcurvflag tick (default=OFF) controls
whether oldstyle valfiles are written (3-byte
index, 4-byte value) or newcurv valfiles are
written (all vtxs, no indices, 4-byte value).
If ON, ignores $allverticesflag.

