** --muhome
use a non-default directory to store and read the database, write the logs, etc.
By default, ~mu~ uses the XDG Base Directory Specification (e.g. on GNU/Linux this
defaults to =~/.cache/mu= and =~/.config/mu=). Earlier versions of ~mu~ defaulted to
=~/.mu=, which now requires =--muhome=~/.mu=.

The environment variable ~MUHOME~ can be used as an alternative to ~--muhome~. The
latter has precedence.

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