[COORDINATE] refactor starting year & df_temporal_coordinates. to normalize the same way any temporal covariate. So that each fit has the same type of normalized data as input. add multiple transformation.

[COORDINATES] add one test to test_transformation. add some copying during coordinate transformation.

[SCM] add permutation which correspond to the sum of rainfall & snowfall. add test based on Durand paper.

[SAFRAN] move safran directory inside experiment directory, add safran visualizer. add smooth marginal estimation & full estimation

[DATA] add safran extended (which include as massifs: the original massif + the 4 alps regions + the whole alps)

[MAX STABLE MODEL] add fitmaxstab for 1D coordinates (by building 2D coordinates from the 1D coordinates)