[FR] setup.sh always exiting with 1

As `conscript/setup.sh` always executes `cs` as the last thing, the script's exit status will be 1, as cs fails due to no args are passed.

I'd like to see either

- cs execution be removed from the script; or
- offer setup.sh additional flag for stand-alone execution, to skip cs invocation.

Reasoning: automated install scripts referencing setup.sh report bogus failures.