Merged requested to merge mgreen/nektar:fix/3d_bl_wing_testcase into master
The STEP file used for the 3d_bl_wing test case was faulty.
This MR contains an updated CAD file that matches the file used in the upcoming NekMesh paper and is verified as working correctly. The MCF file has also been updated to account for the changes and provide better values for mesh size and refinement that guarantee no invalid elements are generated. No other changes to the code or the .tst file are required.