Add tests

[f-f]

There should be some tests so that we have some kind of assurance that we don't break stuff.

Anything is good to start, even just a bash script that installs the binary, runs some commands and checks that the return codes are all right.
This should prevent simple breakage, like what happened when 4e9c20e lead to #29

[justinwoo]

These tests should probably also take into account the difference between Psc-Package projects using local-setup, insdhall and Spacchetti projects using whatever else

[f-f]

Yeah, probably best to change the names of the psc-package-related commands, so like

• spacchetti insdhall → spacchetti psc-package-install and
• spacchetti local-setup → spacchetti psc-package-local-setup

[justinwoo]

psc-package-insdhall, it's a big selling point for this tool

[justinwoo]

It also needs some deprecation warnings since many of my other projects will break

[f-f]

Right, then probably best to do the renaming of commands together with #23 so we don't break things