Alx Sa authored Jul 24, 2022 and Jacob Boerema committed Aug 19, 2022

Optionally includes the previously saved 
Duotone color space data on PSD export.
New load dialogue alerts user if duotone data was imported.
New export dialogue appears if the image is still grayscale and
the parasite exists.
If selected, the mode is set to PSD_DUOTONE in the header and
the original duotone data is written in the color space section.