broadcasting to all connections operational
broadcasting to all connections operational

* implementation is still unfortunate
* race conditions possible since mutexes for connection accept and
  server thread could conflict

Signed-off-by: Otto Linnemann <7de248b886c97f4abb802c2f9a28982229b1f05e@peiker.de>

linneman/libintercom,linneman/libintercom,linneman/libintercom