Merged r3451 from trunk.
Merged r3452 from trunk.
Merged r3447 from trunk.
Merged r3448 and r3455 from trunk.
Cleanup.
Fixed: Links in Forum mails should redirect to message, not topic (#4884).
Adds a controller hook before issue move (#4850).
Adds a hook on issue move form (#4850).
Fixes INSTALL and UPGRADING steps order (#4848).
Refactor: Extract #get_user_dn from AuthSourceLdap.