Daany v1.3.0 nuget package

[bhrnjica]

What's new:

• support for multiple dotnet versions (net6.0;net5.0;netcoreapp3.1)

Nuget packages:

Daany.DataFrame v1.3.0 (https://www.nuget.org/packages/Daany.DataFrame/)
Daany.DataFrame.Ext v1.3.0 (https://www.nuget.org/packages/Daany.DataFrame.Ext/)
Daany.Stat v1.030 (https://www.nuget.org/packages/Daany.Stat/)
Daany.LinA.win-x64 v1.3.0 (https://www.nuget.org/packages/Daany.LinA.win-x64/)
Daany.LinA.linux-x64 v1.3.0 (https://www.nuget.org/packages/Daany.LinA.linux-x64/)

The version introduces the separate packages of Daany.LinA by targeting windows and linux.
More info at: https://bhrnjica.github.io/daany/

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This discussion was created from the release Daany v1.3.0 nuget package.