Feature: add a possibility to change the atlas AP position in the review mode

[NicoKiaru]

See https://forum.image.sc/t/abba-workflow-for-ap-positioning/116019/3

[imagesc-bot]

This issue has been mentioned on Image.sc Forum. There might be relevant details there:

https://forum.image.sc/t/abba-workflow-for-ap-positioning/116019/4