First Catch2 tests for structural 2D elements

[jdeaton]

This PR completes the chain of additions of Catch2 tests (#60, #70, #79) for existing MAST library capability that was originally primarily implemented by @JohnDN90. The additions here are related to 2D structural elements.

Below is a checklist of commits implemented by @JohnDN90 in his add_catch2_tests branch the whose contents/functionality need rolled in. The checklist ones will be covered in this PR:

• Added catch2 header file for upcoming new tests. (Catch2 unit testing capability, a few example/basic unit tests, and tests running on Travis CI. #60)
• Bug fixes and enhancements to CMake files. (Catch2 unit testing capability, a few example/basic unit tests, and tests running on Travis CI. #60)
• Added option to use libmesh_devel (development) version. (Catch2 unit testing capability, a few example/basic unit tests, and tests running on Travis CI. #60)
• Added catch2 tests for some MAST base functions. (Catch2 unit testing capability, a few example/basic unit tests, and tests running on Travis CI. #60)
• Added catch2 test for TEMPERATURE boundary condition. (Additional Catch2 tests of existing functionality. #70)
• Added catch2 tests for mast_boundary_condition_base (Additional Catch2 tests of existing functionality. #70)
• Removed shear coefficient (kappa) from isotropic material. Added plane strain support to isotropic material. (Catch2 unit testing capability, a few example/basic unit tests, and tests running on Travis CI. #60)
• Added catch2 tests for mast_isotropic_material. (Catch2 unit testing capability, a few example/basic unit tests, and tests running on Travis CI. #60)
• Multiple changes to orthotropic material, including added plane strain support. (Catch2 unit testing capability, a few example/basic unit tests, and tests running on Travis CI. #60)
• Added catch2 tests for orthotropic_material_property_card. (Catch2 unit testing capability, a few example/basic unit tests, and tests running on Travis CI. #60)
• Moved shear coefficient (kappa) to 2D section card and added overloaded functions to 2D section card. (Catch2 unit testing capability, a few example/basic unit tests, and tests running on Travis CI. #60)
• Added catch2 tests for solid_2d_section_element_property_card. (Additional Catch2 tests of existing functionality. #70)
• Added overloaded functions to isotropic 3D section property card. (Additional Catch2 tests of existing functionality. #70)
• Added catch2 tests for isotropic_element_property_card_3D. (Additional Catch2 tests of existing functionality. #70)
• Added new public release statement to README. (addressing later)
• Add overloaded functions to solid_1d_section_element_property_card. (Additional Catch2 tests of existing functionality. #70)
• Formatting for README.md (addressing later)
• Multiple changes to 1d_solid_section_element_property_card. (Additional Catch2 tests of existing functionality. #70)
• Added catch2 tests for solid_1d_section_element_property_card. (Additional Catch2 tests of existing functionality. #70)
• Added basic catch2 tests for generic 1D structural elements. (First Catch2 tests for structural 1D elements #79)
• Fixed bug in GitHub Issue MAST::NO_BENDING calling TimoshenkoBendingOperator in 1D analysis #41 where NO_BENDING incorrectly called TIMOSHENKO. (First Catch2 tests for structural 1D elements #79)
• Added catch2 tests for 1D structural element with extension and torsion. (First Catch2 tests for structural 1D elements #79)
• Fixed bug in GitHub issue Incorrect bending about y-axis #43, where incorrect I value was being used for bending about y-axis. (Fix 1D structural element Jacobian #75)
• Added many for tests for 1D structural 2-noded (edge2) element. (First Catch2 tests for structural 1D elements #79)
• Added generic catch2 tests for 2D structrual elements. (THIS PR)
• Added many catch2 tests for 4-node quadrilaterial 2D element (quad4). (THIS PR)
• UPDATE EXAMPLES MOVING KAPPA FROM MATERIAL TO SECTION CARD (Catch2 unit testing capability, a few example/basic unit tests, and tests running on Travis CI. #60)
• Fixed bugs in catch2 tests which caused some to fail when run with a debug version of MAST. (First Catch2 tests for structural 1D elements #79, completed in this PR)
• Necessary tweak to tests for zero and negative eigenvalues. (First Catch2 tests for structural 1D elements #79)

[manavbhatia]

Just curious why there appear to be the same changes introduced in #79 and #80.

[jdeaton]

Just curious why there appear to be the same changes introduced in #79 and #80.

It will go away here shortly. I wanted to get this up early while John was fixing something else over in #79. Once I merge #79 into master I'll rebase this branch on-top of the updated master and force push back to GitHub. It will wipe out those duplicated commits in this PR.

[jdeaton]

Merging this one now as it completes refactoring of John's initial catch tests to reduce code duplication. There is still more testing required for 2D structural elements, but it can be added later.