Test - Additional geometry tests

[jfussbro]

…Contents

Describe your changes here:

The new tests test the t8_geometry_occ functions. Now there are tests for the linkage of linear and curved curves and surfaces for all 2d element types.

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As a reviewer please read through all the code lines and make sure that the code is fully understood, bug free, well-documented and well-structured.

General

• The reviewer executed the new code features at least once and checked the results manually

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Tests

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Licence

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[Davknapp]

Just had a quick look at it and found an opportunity to use one of our custom assertions to compare two 3D-vectors.

[sandro-elsweijer]

We should also test every orientation of the trees

[sandro-elsweijer]

We should also test every orientation of the trees

[sandro-elsweijer]

lgtm

[sandro-elsweijer]

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