Add preference to allow merging synonymized nodes

[bronwyncombs]

Reported By
Robyn from RBGE:

We were trying to do some tidying in the tree and are finding that we are unable to merge synonyms. One of the examples we are looking at is a synonym into a synonym (Unk. Aceraceae into Aceraceae). Is there a preference, similar to the one allowing us to create children of synonyms that would allow us to do this?

Unk. Aceraceae tree location
Aceraceae tree location

Additional context
Add any other context or screenshots about the feature request here.

About the mentioned remote pref for adding children to synonyms:

PR #2778

Speciforum announcement

[grantfitzsimmons]

Is there a way to merge two synonyms that are duplicates? I have two occurrences of the Infraclass Acari in our Invertebrate database and each has associated specimens. Since their preferred taxa is listed as the same I’m not sure how to fix it so that there is only one.

Reported by: Ashley Ferguson at College of Idaho

https://discourse.specifysoftware.org/t/duplicate-synonyms-with-associated-taxa/1645?u=specify

[specifysoftware]

This issue has been mentioned on Specify Community Forum. There might be relevant details there:

https://discourse.specifysoftware.org/t/duplicate-synonyms-with-associated-taxa/1645/2

[emenslin]

Possibly relevent #3292