Geometrical derivatives #109
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This PR brings code from GridapTopOpt.
Given a mesh cut by a finite-element-defined level set
φh, and a functionalj(uh,φh), the changes allow the user to compute the gradient ofjw.r.t. the geometry, i.e∂ j(uh,φh) / ∂ φh.We provide two methods, which are equivalent up to machine error:
While I was doing this, I also added a fully-fledged documentation.