Create a way to merge taxonomic sources

Platform(s), such as mobile, website, API, other: web

URLs (aka web addresses) of any pages, if relevant:

Description of need: There are tons of duplicate sources, e.g. there are dozens of identical sources titled POWO (Plants of the World Online) ( that could be merged for simplicity and to save space.

Feature request details: Some sort of tool like the place merger or taxon swaps, but for sources.