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Fix issue 21 by adjusting min max buffer period for portable stamp to 30 days. 7 was too short in .NET 5.0. Fix issue 22 by changing '+' to '-' where in subtraction operator for a minuend of type portablemonotonicstamp and a subtrahend of portable duration. Add unit test to prove fix. Change all C# ancillary projects (unit test, example code, test app) to be built and run against .NET 5.0 rather than .NETCore 3.0. Change version number to 1.0.0.4. Update Readme.md; Update Release.txt.