Add chiral magnetoelastic field and force with tests#164
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Materials of the cubic point group 23 (or B20 compounds) can have an additional chiral magnetoelastic coupling, with the following energy density (https://doi.org/10.5445/IR/1000184834).
$\mathcal{E} = B_c \sum_{i, j, k} \epsilon_{ijk} \varepsilon_{ii} m_j^2$
This pull request adds the effective field and force density resulting from this energy density, including unit tests.