Add mesh files for roughness test case.

* new regression test for mutation++ with NEMO

* Update master (#57)

* Add mesh files for roughness test case.

* update reference file (#56)

Co-authored-by: koodlyakshay <koodlyakshay@gmail.com>
Co-authored-by: Tim Albring <tim.albring@scicomp.uni-kl.de>

Co-authored-by: CatarinaGarbacz <ana.gomes@strath.ac.uk>
Co-authored-by: koodlyakshay <koodlyakshay@gmail.com>
Co-authored-by: Tim Albring <tim.albring@scicomp.uni-kl.de>

add testcase for intersection prevention

axisymmetric RANS: add mesh and restart file file

* Streamwise periodic incompressible testcase mesh added.

* Added 3D 1Slice pipe mesh for streamwise periodicity.

* Adding 2 small meshes for streamwise periodic flow

* Add gmsh .geo files (and other) for streamwise periodicity.

* Added cht mesh with FFD box

* Added primal solution for DA streamwise periodic case.

* Changed solution files for cht streamwise case.

* Little change of restart file for streamwise periodic.

* Change restart file for cht_pinarry testcase for DA.

* Change mesh.

* Removing unneccesary files

Co-authored-by: TobiKattmann <tobiaskattmann@gmail.com>