Also output in the status report that the user is very silly

Starve the TTY of input to ensure this works, but provide yes to the
current installer to handle the current broken case.

Don't install a second nix after the initial installation, and the rsync change fixes a bug hidden by the nix replacement where the store files were being owned by the installing user due to rsync's -a implying -og.

relevant directions

Prompt for sudo before validating assumptions, and check ourselves for root-owned files instead of making a scary warning.

Fixes #1464.

Not really necessary anymore for #849, but still nice to have.

Fixes #849.

Fix potential crash/wrong result two hashes of unequal length are compared

Clearer error message when regex exceeds space limit

Not sure about the raw ellipsis.

Don’t hardlink disallowed paths in OS X.

Fix nix-instantiate manpage indentation

Fixes #1443

The second command variant is now its own cmdsynopsis, which ensures
it's not indented as was the case using sbrk.