rename field deps to depends and ndeps to ndepends, add requiredby and nrequiredby field. Change interface of service_resolve_sort_bytype. Add service_resolve_create_master function

rename service_resolve_svtree function to service_intree. Rename struct ss_resolve_graph_style to info_graph_style

complete reframe of resolve API function: allow to use different struct of resolve in function of the object to deal with. Split service and tree resolve function to separated file.