Terminate installation if any installation step yields an error.

[a-t-0]

• (Superfluous to second) Ensure each command stops if the previous command yielded an error.
• Ensure a single command error stops a script, without it continuing further.
  • (Optional) provide opportunity to send log of prematurely terminated installation to developer.
    • Form transparent opinion on what is considered private data or not w.r.t. debug collection.
    • Clearly visualize to user which non-private data would be sent.
    • Don't send private data.
    • Easily allow user to remove elements of data that are not desirable to be shared.
    • See #26