Includes joint work with @abmclin, @pmatos, and @jessealama. original commit: 70559d074f70dcadec5cea3619f75f91fcda77eb
7.ss, scheme.1.in, comments of many files original commit: 06f858f9a505b9d6fb6ca1ac97234927cb2dc641
original commit: 47a210c15c63ba9677852269447bd2f2598b51fe