Deleted "Num. Comput./#7. Equation Solving", as it wasn't fully done.
Cleaned repo. Removed "shebangs" and fixed permissions.
"Num. Comput./#5, #6. Spline Interpolation" - done.
"Num. Comput./#8. Matrix Equation Solving" - done.
"Num. Comput./#9. Matrix Inversing" - done.
"Num. Comput./#10. Diff. Equation Solving #1" - done.
"Num. Comput./#12. Diff. Equation Solving Test" - done.
"Num. Comput./#13. Diff. Equation Solving #2" - done.