Document extended status command

Martin Langrequested to merge
document-status-command into main

  • status without argument shows installed releases

  • status with release and package-set shows all installed packages.

    I have truncated the output for this to just a few packages. The rest is currently still in the README as a comment. I would delete the comment if you think the current shortened list is okay.

  • fix indentation problems in README

  • fix output from status command to avoid confusion between available and installed

Closes tickets#27

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