revamp 66-init. Provide option to only init enabled service or disabled service or all service of a trees

remove function about backup handling: the backup directory is now handled completely differently without the use of s6-rc

remove use of s6-rc. Split sanitize_system to new function. Revamp clone feature. Do not handle anymore backup directory at clone time. Pass to new graph_matrix_get_edge_g_sorted_sa() and graph_matrix_get_edge_g_sa() functions interface

create fdholderd and oneshotd service directory at scandir creation. Remove creation of livetree directory