1.7.1

Changed

• docker-compose.yml now reads every operator setting from the environment, so
  a Docker UI's environment editor works without editing the file.

Fixed

• Import from another dashboard reads inline lists and mappings, environment
  placeholders, anchors on a value, and a comment after a quoted value.

• Import from another dashboard no longer refuses a whole file over one
  unreadable line. The line is listed in the preview and the rest is imported.

• Settings > About shows the version again, and the update link is translated.

• Serving a bundled icon no longer logs an nginx error.

• The home-screen icon is served on an install that has uploaded no icons.

• The TRUST_PROXY warning now gives an example value and where to set it.

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Thanks to @ExXxtr3me for reporting #106.