Update 01_GKZ/tutorial_1_numbers.ipynb, 01_GKZ/tutorial_1_numbers2.ipynb,...

Update 01_GKZ/tutorial_1_numbers.ipynb, 01_GKZ/tutorial_1_numbers2.ipynb, 02_LGS/tutorial_2_ausgleichsrechnung.ipynb, 02_LGS/tutorial_2_lgs.ipynb, 02_LGS/tutorial_2_beispiel_aufgaben.ipynb, 02_LGS/imgs/anz3.png, 02_LGS/imgs/anz2.png, 02_LGS/imgs/anz1.png, 02_LGS/imgs/int.png, 02_LGS/imgs/int1.png, 02_LGS/imgs/lr.png, 02_LGS/imgs/lr_solution.png, 02_LGS/imgs/ols.png, 02_LGS/imgs/tls.png, 02_LGS/imgs/sq_vs_abs3.png, 02_LGS/imgs/sq_vs_abs2.png, 02_LGS/imgs/sq_vs_abs.png, 02_LGS/imgs/int2.png, 02_LGS/imgs/tomograph2.png, 02_LGS/imgs/tomograph1.png