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London Equation bugfix #311

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The London equation implementation has an issue where the london depth is added as a curlcurl term, where it should have been added as a mass term. This was due to a typo where df was used instead of f. The effect of the London equation is to make a reaction-diffusion (second order) boundary layer in the London region, which is independent of driving frequency, hence needing the mass term. The magnetic boundary layer effect was confirmed after this fix.

Additionally to get good results requires disabling the divergence free cleaner, as the mass term results in a change to the nullspace of the stiffness matrix.
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@hughcars hughcars added the bug Something isn't working label Dec 10, 2024
@hughcars hughcars force-pushed the hughcars/london-equation-bugfix branch from f2298c3 to e67c73b Compare December 24, 2024 14:23
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