Do not query git for tags and branches multiple times per request.
Remove invalid utf8 sequences from commit comments and author name (#4773).
Merged r3398 from trunk.
Merged r3409 from trunk.
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).