II am trying to set up Sumatra such that it tracks two separate version-controlled directories, where the second is library code that may be shared between projects. (This code is installed with pip -e and imported as any other library in `main.py`.) At the moment I have run `smt init` in the main project directory, but how would I tell Sumatra to also track the library repository, in exactly the same way as the main one ? Is this possible ?