Twice continuously differentiable approximation to the Heaviside function
Twice Lipschitz continuously differentiable approximation to the Heaviside(.,.) function.
See Example 
Buildings.Utilities.Math.Examples.SmoothHeaviside.
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October 21, 2019:
 Addeddelta.minattribute to guard against division by zero.
 This is for
issue 1202.
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July 17, 2015, by Marcus Fuchs:
 Add link to example.
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July 14, 2010, by Wangda Zuo:
 First implementation.
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