Improvements

Enables participant individual reports
Fix small issues in the text in main report
Implement modules of data handling and analysis to allow the generation of different reports
Add a simple forward selection to choose the best covariates for the Plackett-Luce trees
Optimize the main script to avoid mistakes in placing tables and indices
Update the participant reports, now the report in rendered as one single file (two per participant) and uses new display items i) a vertical bar plot to illustrate a podium ii) a horizontal bar plot with the probabilities of winning for the varieties in the baseline trait

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