Okular wants to "Save"

TLDR - Short version:
We are reworking part of the "Save As" code, and we are adding the long-requested "Save" button! The old "internal implicit save" behavior is being dropped and we need your input about what to do with data saved internally by previous Okular versions.

Please visit https://forum.kde.org/viewtopic.php?f=251&t=122750 and share your opinion on the poll/comments.