Merge origin/master

.gitignore

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+/specifications/Makefile
+/specifications/README.txt
+/specifications/SISO-REF-010-v24
+/specifications/RPR*.xml
+/specifications/SISO*.xml
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+!/specifications/2019-SIW-Presentation-039_CompressedDis.pdf
+!/specifications/IeeeDisPduColorFigures.pdf
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+/specifications/downloads/IEEE1278.1-2012.DistributedInteractiveSimulation.ApplicationProtocols.12781-2012.pdf
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