[ABW]: fixed link to tests (was local commit)

mutes_get_blacklists_for_observer slightly modified: added filter flags and explicit information if accounts are blacklisted or muted
fixed get_relationship_between_account: is_blacklisted in results was misleading, replaced with blacklists
does_user_follow_any_lists and get_follow_list reimplemented with use of get_blacklists_for_observer