This is supposed to fix the last error, but for some reason it doesn't.

Agreed on jabber.

- Remove explicit statements about which server supports which feature
- Clarify planned Logging config changes.

[297-old-text-about-multiple-classes-guards] Updated doc about one class vs classes (allow/deny old/not implemented idea)

    Merge branch '278-add-documention-on-developing-your-own-packet-queue-implementation-to-developer-s-guide'

    Re-merged with master.

    Merge branch '277-finalize-whether-congestion-handling-is-enabled-or-disabled-by-default'