New surface mesh is imposed in the viscous solver in 2D and stagnation point is recomputed at the first coupling iteration

Added adjoint for AoA and mesh in 2D. Nodes indices are now passed to the BoundaryLayer object

Adjoint is not working because the delta star box is missing

Boundary layer c++ objects are created in python with swig and are manipulated by the interface. The initial condition of the viscous solver was changed. All test cases have been adapted. A decrease in the number of iterations is globally observed. Results are slightly improved especially for the RAE validation case.

Added the script, the lfs mesh for the inviscid calculation and the geo file to generate the viscous (structured) surface mesh. Minor changes in the interfaces, in particular associating different names to the different sections if needed.

Fixed API, dart interface and prevented segfault if the number of sections is not imposed correctly.

Contains 2D and 3D developements as well as the api.