also, flatten the workspace into a single crate. I forget what the original reason for the workspace was -- I think it was added because `cargo t -p testsuite` is nicer than running `cargo t --test $filename` N times. However, a single crate removes the need to repeat the list of dependencies in `testsuite/Cargo.toml` also, document the two sets of tests included with the template and how to run them in the README file