Revamping all names and project layout

We now say "reaction site" instead of "join definition" and "emitting a molecule" instead of "injecting a molecule". The API has changed from join ( run { ... } ) to site ( go { ... } ).

There are now more stringent checks on the code. Deprecation warnings and other warnings are enabled. The syntax f() for functions with Unit argument caused a deprecation warning that has now been eliminated, thanks to more sophisticated macros.