Quite some advancements to the report

	modified:   data/Airfoil.xlsx
	modified:   report/diag/integral.nb
	new file:   report/diag/polar_diag.pdf
	new file:   report/diag/pressure_points.pdf
	modified:   report/diag/wing_profile.nb
	new file:   report/diag/wing_profile.pdf
	modified:   report/report4.tex