src/find_interaction_cluster/clip_figures/clip_compo_analyser.py: chnages and...

src/find_interaction_cluster/clip_figures/clip_compo_analyser.py: chnages and creation of new functions

creation of function to handle clip results folder produced by clip_launcher_4_many_communities and modification of get_middle_group, get_extreme_groups and get_interest_groups to simplify the names of each groups + pep8 chnages