• sftpfs: improve rename, remove, readlink.
• web setup: add an optional installation code. The purpose of this code is to prevent anyone who can access to
  the initial setup screen from creating an admin user.
• db defender: fixed the query to get banned hosts.
• docker: add rsync and jq to full image variants.
• sshd: disable sha1 based KEXs and MACs by default.
• be sure to close an SSH connection if all channels are idle.
• fix UTC logging.
• other minor improvements and bug fixes.