Fix Username changes not correctly displaying on the user profile tab.
Move more template code from the template modifications for the members_view into the useress_member_view_tabs_heading and useress_member_view_tabs_content templates.
Improve add-on compatibility by ensuring the wrapper is applied much later
Rewrite Username change feature to be more robust and consistent
Improve UI for user; consistently and correctly display why a username can't be used.
Improve UI for moderators; by adding extra information to the moderated user name change request.
Moderated username changes can always be approved, regardless of the general configuration.
Option to control if AdminCP renames are logged to the username change history
Merging users merges user rename history, includes into rename history the merge event.
Breaks out updating username information in content to work in a deferred tasks to prevent users with huge numbers of posts blocking the site for everyone. This applies to user merging!