add mathematica file

See merge request !12

adding non linear parameter in geo file + non linear FEM residual stopping criterion + validation large rotation

accélération du code BEM

See merge request !11

Bug bem correction

See merge request !10

# Conflicts:
#   srcs/BEM/functionsBEM.cpp
#   srcs/BEM/functionsBEM.hpp
#   srcs/BEM/solverBEM.cpp
#   srcs/main.cpp
#   srcs/squeeze.geo

SECOND PROGRESS DEADLINE

See merge request !8