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[ML] integration for triangles with 7 IPs

Florian Zill requested to merge github/fork/FZill/GL_TRI_7 into master

Added Gauss-Legendre Integration for Triangles with 7 Integration Points. Necessary to output secondary variables at least in HM. We might change the integration order to 5 as in the reference, but I opted for 4 as it is the 4th option available. Values are from here (Appendix II, p=5): Dunavant, D. A. "High degree efficient symmetrical Gaussian quadrature rules for the triangle." International journal for numerical methods in engineering 21.6 (1985): 1129-1148. URL: https://onlinelibrary.wiley.com/doi/epdf/10.1002/nme.1620210612

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