LL-294 Message is based on Thing not entity.
LL-294 Message is based on Thing not entity.

Changed schema for Message type. It is clearly not an entity (from BnP
perspective; although it is for SSS). Uisng Thing instead so that
Message would not pass Model.isof(entity) test.

learning-layers/BitsAndPieces,learning-layers/BitsAndPieces