[MIN] 404 compat BuildErrors

They are usually caused by old links that were broken before
[VER] Bump version
[FIX] Encode XMLGen output as UTF8
[FIX] Accesskey-protected category material
[FIX] fix typo in participant list
[IMP] RegForm: Disabled inputs data is sent
[FIX] RegForm: Empty space on empty string
[FIX] RegForm: yesno field validation
[FIX] RegForm modify: keep previous value
[MIN] RegForm style tweaks
[IMP] RegForm non-billable sessions on priorities
[FIX] RegForm: textarea default size
[FIX] RegForm: Social events with 0 places
[FIX] Authentication bug - stopping on first account
[FIX] Pretty URL for session material