Manage issues link in issues/comments without the "issue-link" class
Split the fetch_all in two steps for the first fetch of a repository

Closed issues and comments are fetched in an other job to set the
repository as available quickly
On issues lists, select/prefetch related only if grouping

In no-grouping case, no select/prefetch of related is needed because we
assume all the templates are already cached
In grouping case we need data to do the grouping. A TODO exists to limit
stuff to select/prefetch to the only one needed to group
Fetch 100 items per page, not 30

(bad commit in the past)
Speed up filter bar rendering for heavy creators/closers lists

It's done by rendering the list in JS if more than 50 users in the lists