[leveller] Leveller 2.6 alpha build 2404 available

Changes are:

- Select Elevs command has replace/add/subtract option
  handled by separate "Integrate Selection" dialog box.

- Select Visible and Select Lit commands implemented. These
  select the heightfield pixels that are, respectively,
  visible to the camera or lit by the light source.
  They also use the new Integrate Selection dialog to
  offer replace/add/subtraction of the previous selmask
  in a standard manner.

- Default long operation behavior is to enable interruption
  via the Esc key. Policy is to not have any long operation
  require running uninterrupted; if the program crashes
  when the Esc key is used, it's not a fix to set the
  "don't allow interruptions" flag for that operation.

Select Visible is handy in that it can help produce heightfields
optimized for a static scene where the camera (even if it can rotate)
is in a fixed position. After selecting the visible parts of the
heightfield, you can invert it to select the invisible pixels, then
flatten them. The resulting HF will RLE compress much better
and/or produce optimized meshes better. Inverting Select Lit will
select shadows.

Ray


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