How to get Octave 4.4 for macOS

Octave 4.4 is a major new release with many new features, better compatibility with Matlab, and many new and improved functions. Mac users can get a first binary (dmg) for testing from here. Please report issues at the mailing list. Homebrew users should soon be able to get Octave from https://github.com/dpo/homebrew-openblas (pull request #61).