When `mdirs` is executed without any arguments, look for the `Maildir`
key in the profile and use that instead (if set).
Closes: #245 [via git-merge-pr]
- SYNOPSIS: Delete 'and customization', change 'for' to 'of'
- Tidy up first few lines of DESCRIPTION
- Change wording for 'Outbox:'
- Change wording for 'Sendmail: and 'Sendmail-Args:'
- Add 'files' to 'configuration' in ENVIRONMENT
Closes: #45 [via git-merge-pr]