Update Gallery Part II

[prisae]

In #217 Part I was done: frequency domain; reproducing; and published. Here the missing ones:

Update Gallery

• Replace LaTeX in figures by unicode symbols
• Replace implicit by explicit pyplot (OO)
• Use by default coordinate system with positive z upwards

To Do

• time_domain
  • [ ] cole_cole_ip.py
  • [ ] dc_rho-a_dip-dip.py
  • [ ] note_for_land_csem.py
  • [ ] step_and_impulse.py
  • [ ] tem_walktem.py
• educational
  • [ ] coordinate_system.py
  • [ ] dipoles_and_loops.py
  • [ ] dlf_design.py
  • [ ] dlf_standard_lagged_splined.py
  • [ ] halfspace_vs_dipole.py
  • [ ] ht_ft_with_other_modellers.py
  • [ ] random_noise_f_domain.py
  • [ ] tmte_split.py