generate Add mbuf api funcion to reference to trace dat1

The rmr_trace_ref() function has been added to allow the user
programme the ability to obtain a direct reference to the
trace data in a message buffer.

Signed-off-by: E. Scott Daniels <daniels@research.att.com>
Change-Id: I2450dc4473b815460a8f011897f4b0a16d45fc51
Signed-off-by: E. Scott Daniels <daniels@research.att.com>
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+
+Change Summaries
+
+2019 July 11; Version 1.0.37
+
+	librmr and librmr_nng 
+		- Add message buffer API function rmr_trace_ref()
+		  (see rmr_trace_ref.3 manual page in dev package).