Reverse-shortcut option (Original in album, shortcuts in ALL_PHOTOS folder)

[Wacheee]

The original shortcut option creates shortcuts/symlinks in album folders and keeps the original in the ALL_PHOTOS folder. In my case, I needed to keep the original photo in my album folders and create a shortcut in the ALL_PHOTOS folder, as I felt that it was more organized that way.

This PR adds a new option [4] reverse-shortcut. Now, I can keep the original photo file in album folders and create a shortcut in the ALL_PHOTOS/years albums.

Limitations

• If a photo is in multiple albums, the original will be in all other albums (except ALL_PHOTOS/years albums).
• If a photo is in multiple albums, the shortcuts/symlinks in "ALL_PHOTOS" will point to only one of those albums.