contraction benefits ok

exec/execution_times/aude.cpp

exec/execution_times/biorevaix.cpp

exec/execution_times/contraction_benefits.cpp

exec/execution_times/marseille.cpp

exec/execution_times/quebec.cpp

exec/quality_of_solutions/aude.cpp

exec/quality_of_solutions/biorevaix.cpp

exec/quality_of_solutions/marseille.cpp

exec/quality_of_solutions/quebec.cpp

plot_scripts/contraction_benefits.py

plot_scripts/execution_times_tiled.py

plot_scripts/optimum_ratios_tiled.py

plot_scripts/pl_sizes_table.py

plot_scripts/table_optimum_ratios.py