GitLab

* bring debug checking back to top level so we have more control over
  CPU profiling.

* bring help text up to top level so we can exit from the program
  at the top level instead of within an arbitrary function

commands: Made Command run functions return (interface{}, error) instead of setting the values in the response

commands/http: Don't set Content-Type for stream outputs so browsers can MIME-sniff the actual content type