kgv 23fe70ec52 0031189: Draw Harness, ViewerTest - send messages to Message::DefaultMessenger() ...

Added short-cuts methods in Message_Messenger for sending message with specified gravity,
and stream buffer class for using stream-like interface for that.
Similar short-cuts to DefaultMessenger() are added in Message package.

ViewerTest has been updated to send messages to Message::DefaultMessenger()
instead of direct output to std::cout/std::cerr.

Off-topic: spelling error (duplicate "and") is corrected in two places

Added test bugs fclasses bug31189

2020-04-30 19:42:44 +03:00

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