Fixing an issue and implements a feature request around linking versions of papers

[egonw]

Fixes #1597 and fixes #1886

Description

The first (oldest) patch fixes the problem reported in both bug reports. The second (newer) patch implements the suggestion reported in the #1597 (comment) comment (and the similar for retractions).

Caveats

There are no code changes.

Testing

Suggested to test the following pages with various situations, which before/after sometimes differs, demonstrating what is fixed:

• https://scholia.toolforge.org/work/Q24613508
• https://scholia.toolforge.org/work/Q24564615
• https://scholia.toolforge.org/work/Q114679534
• https://scholia.toolforge.org/work/Q102319086
• https://scholia.toolforge.org/work/Q102092244

Checklist

• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• I have not used code from external sources without attribution
• I have considered accessibility in my implementation
• There are no remaining debug statements (print, console.log, ...)