Completions are dynamically generated from the respective binary help
pages.
Completions should be sourced into the shell or added to
$XDG_CONFIG/fish/completions.
Our required Python version 3.6.12 does not support `capture_output` as
a subprocess.run argument; this was added in python 3.7.
We can emulate it by setting stdout and stderr to subprocess.PIPE
Using a ramdisk for the functional tests can give worthwhile speed-ups
for developers and reviewers.
Add notes to test/README.md on how to setup, use and erase a ramdisk on
Linux.
Since the removal of the PartitionChecker code in ab8be98fdb
the documentation of alertnotify no longer matches the implementation.
Instead simply document that alertnotify will be called when "an alert
is raised".
willcl-ark