Changed group and user lists to use no lists. Modified group server and file server to work with this change. Also rewrote createUser, deleteUser, createGroup, deleteGroup, addUserToGroup, removeUserFromGroup. Everything works now and this fixed the bugs related to users and groups. Also changed some functionality...creating a group also automatically makes you a member, since you should be able to work with files in that group. You can also later remove yourself as a member but stay owner. Handling multiple owners works correctly too, although you cannot currently add additional owners.