[PAPER 1] refactor folder. enable in a single script to evaluate trends and return level uncertainty

[Thesis committee drawing] improve GEV non stationary plots.  rename ci_delta to ci_mle. catch some ci runtime exceptions. remove hatch/stripes drawing temporarily. fix unit for snow load. add new crocus classes & variable classes for snow load. modify conversion factor only for the new plots.

[Eurocode drawing] add grid. add function to compute the percentage of significant trend on an example

[CONFIDENCE INTERVAL] in the non stationary case, only the normal method is defined. in the stationary, i managed to add test the "boot" method. But for the "proflik" method there was a crash in R related to the spline, that i did not resolve

[CONFIDENCE INTERVAL] check that ci code return the same interval and mean posterior for the return level as my code with coordinates from 0 to 49. and also with transformed coordinates

[EXTREME ESTIMATOR] add test confidence interval. Add confidence interval with the ci method in the Bayesian case. add test for the stationary case. put the division by 100 (to get snow load) in eurocode vizualizer

[EXTREME ESTIMATOR] Add MLE extreme estimator. refactor test gev temporal extremes. move confidence interval results

[EUROCODE GRAPH] update burn in percentage to 0.5 (update test). delete test region eurocode. update eurocode graph.

[EUROCODE DATA] improve display for the eurocode return level graphs. rename linear margin temporal models.

[TEMPORAL LINEAR MARGIN][BAYESIAN ESTIMATION] modify fevd_fixed prior to ensure that prior is always applied on the shape parameter. add multiprocessing for eurocode return level uncertainty. add option to specify a last year for eurocode uncertainty computation.

[EUROCODE][DRAWING PER REGION] modify test region eurocode. add test_ gev temporal bayesian. add stationary version for the Bayesian. refactor utils at the root, to root_uils to avoid weird import issues.