Add diffusion and refactor#1

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ricmperes wants to merge 6 commits intomainfrom

Field_map_and_diffusion

Commits on Jan 19, 2022

* Update streamline functions
ricmperes
committed

Commits on Mar 10, 2023

Commits on Mar 20, 2023

Added plots of average over Phi and info on 4t FV
ricmperes
committed

Commits on Mar 21, 2023

Update on plots + Streamlines making utilities
ricmperes
committed

Commits on Mar 24, 2023

Fix parallel wires plot bug + figax option
ricmperes
committed