Better user feedback from data modifier.
Simplify empty color and opacity function.
Move the empty image data out of the way of the camera.

Apparently something goes wrong on first render and the empty color and
opacity functions are not respected resulting in a black block.
Changing the origin moves it out of the way so that on startup the
black block does not show up.
Remove unused code
User transform by text input is now supported.

User transform can be made with text.
Moved the user and landmark transformation tools out of the transformation tools file.
Removed unused import.
Make setting auto adjust sample distance explicit.