use correct method in TBGTextDiff (fixes #1604)
thanks to user acp for finding the fix
don't fail completely when invalid links exists (fixes issue #1846)
use correct js function to remove issuetype scheme (fixes issue #1835)
restore "last edited here" lefthand block (fixes issue #1832)
clear username when soft-deleting user, so new users can be created with the same username (fixes issue #1879)
properly save searches for users (fixes issue #1882)
restore accidental overwrite (completely fixes issue #1955)