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Deactivate subdomains

wenqing requested to merge github/fork/wenqing/deactivate_doms into master

This PR adds a feature to deactivate elements in the specified subdomains by material IDs. As a first case, SmallDeformaton is selected for the approach.

A benchmark is included in this PR as well. The benchmark is a duplication of disc_with_hole but the mesh. Its mesh has two material subdomains, and the subdomain of the quarter disk (see the left of the following figure) is deactivated for the assembly. The following figure compares the results of the present benchmark (left) and disc_with_hole (right): comparison

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