Right now the top projects, top users, and top pages tables are sorted by the number of added links in the Wikilink Tool. Given that this might be more than balanced out by the number of removed links, I think it makes sense to sort by the difference between added and removed links, i.e. net gain in links.

We do this in two places:

• https://github.com/WikipediaLibrary/externallinks/blob/master/extlinks/common/helpers.py#L157
• https://github.com/WikipediaLibrary/externallinks/blob/master/extlinks/common/helpers.py#L184

One consideration here needs to be whether sorting by the difference between added and removed substantially lengthens the time for the query to run. This task will also be considered complete if we discover that this would slow the query down enough to not be worthwhile. These are already, currently, the slowest running queries in the tool.