aptly: release $version

aptly: release $version

aptly: release 1.6.0

S3: support disabling ACL with `none` value

This change lets you disable ACL when using S3 by using a configuration
value of `none`. This way we maintain backward compatibility with the
default setting being `private`.

Fixes: aptly-dev#1067

Merge pull request aptly-dev#847 from smira/fix-repo-name

Fix repo name in release script

Buffer increase (aptly-dev#738)

Increase Scanner buffer size for Stanza reader

Merge pull request aptly-dev#683 from smira/545-download-contxt

Use Go context to abort gracefully mirror updates

Merge pull request aptly-dev#614 from smira/600-fix-double-mirror-update

Fix bug with `PoolPath` field being overwritten on mirror update

Merge pull request aptly-dev#613 from smira/607-trim-slashes

Trim slashes while parsing publish prefix

Fix temporary contents DB being left behind after publishing

NB: Go `defer` order execution is reverse to the order `defer` statements
are executed.

So before the change, `Drop()` was called before `Close()`, which was no-op.

Change that to explicit order in single func, print errors if they happen.