Option to place "positive copy" image on top of stack by default

[taylor]

I use a positive TIFF copy of all of my scans as part of my workflow, and part of that workflow involves moving the positive image to the top of the stack after I create them. I certainly would find an option to create the positive image at the top of the stack instead to be a very helpful option.

Thanks for your work on NLP!

[Sciencentistguy]

I would also like this

[nate]

Yep, that should be pretty easy for me to add to the next version

-nate