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For Helmholtz problems, there was so missing support for the singular or near singular integrals when linear basis functions are used.
In this pull request,
I tested the functions by comparing the SauterSchwab, Wilton, and DoubleQuad integrals for the common face/edge/vertex cases and making sure they give similar results, also under the assumption that the Wilton strategy should give results closer to the SauterSchwab strategy than the DoubleQuad does. However, there are some cases where where the DoubleQuad performs better, and I am not sure why that is, it's marked in the code as a comment.
For seperated triangles, I also compare to a reference value that was calculated with the HCubature package.
To get the correct signs in all expressions, this relies on pull request #14 in the WiltonInts84 package.