Multi sample support

Chanjo is now able to handle multiple samples and store them in the same SQLite database. This is great for comparing different samples and keeping all coverage annotations in one place.

A lot of (breaking) changes has had to be made to get to this point. Do check out the updated "chanjo-autopilot" help text if you plan on using the CLI.

I've now also limited Chanjo in scope: it will be focused on reading coverage data and annotating elements. Everything else downstream will be handled by a separate, although, connected package. Announcement later :)

Lastly Chanjo now extends the SQL schema structure found in my own new Elemental DB project.