[contrasting project] add file that enable to reveal the snow partition for biggest snow load observed. refactor crocus files

[contrasting project] add test for study loader. refactor their init function to have a better error message.

[contrasting project] remove the restriction of maxima to winter. because i will focus only on snowfall so i don't really need that restriction

[contrasting project] generate plot for the trends in return levels for the winter extended. do the same for the distribution of wps. remove winter_maxima and summer_maxima in abstract_study.py

[contrasting project] add test_year_to_winter_date. add the possibility to select a season for in abstract_study.py

[contrasting project] add main_distribution_wps.py to study the (spatial and temporal) distribution of weather patterns that are causing maxima in the different region of the French Alps

[contrasting project] modify year_max, from now on it will be the year max reached by the data, and not the year max + 1.

[contrasting project] add test assertion for the weather patterns. rename constant file to utils.py. add some function to create a standard str for the dates.

[quantile regression project]  final modification. attempt to add multiprocessing. but results are not conclusive

[quantile regression project]  fix bugs in daily_observations.py for the creation of the coordinates for the daily fit. some fix to prepare for some potential non stationary exponential model one day

[quantile regression project] add test exp simulations (stationary and non stationary) for models on annual maxima. Prepare the code to fit with non stationary exponential models

[quantile regression project] add annual maxima osbervation from daily exponential. add sammple_r_function as argument to rmargin_from_nb_obs. add abstract extreme params