Add / Update xp 0

experiments/SIAM/.gitignore

experiments/SIAM/setup.py

experiments/SIAM/setups.json

experiments/SIAM/slopepb.py

experiments/SIAM/xp_0_balls/make_fig_paper.sh

experiments/SIAM/xp_0_balls/process_data.py

experiments/SIAM/xp_0_balls/xp_a_accuracy_sol.py

experiments/SIAM/xp_0_balls/xp_b_screening.py

experiments/SIAM/xp_0_balls/xp_c_viz_paper.py

src/screening/gap_test_all.c

src/screening/gap_test_all.pyx

src/screening/gap_test_p_1.c

src/screening/gap_test_p_1.pyx