Parsedmarc

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- Set a configurable default IMAP timeout of 30 seconds
- Set a configurable maximum of 4 IMAP timeout retry attempts
- Add support for reading ``MBOX`` files
- Set a configurable Elasticsearch timeout of 60 seconds

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- Set set minimum `publicsuffix2` version

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- Bump required `mailsuite` version to `1.2.1`

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- Fix typos in the CLI documentation
- Bump required `mailsuite` version to `1.1.1`

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- Merge PR 100 from michaeldavie
- Correct a bug introduced in 6.5.1 that caused only the last record's data
to be used for each row in an aggregate report's CSV version.
- Use `mailsuite` 1.1.0 to fix issues with some IMAP servers (closes issue 103)
- Always use ``/`` as the folder hierarchy separator, and convert to the
server's hierarchy separator in the background
- Always remove folder name characters that conflict with the server's
hierarchy separators
- Prepend the namespace to the folder path when required

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- Merge PR 98 from michaeldavie
- Add functions
- `parsed_aggregate_reports_to_csv_row(reports)`
- `parsed_forensic_reports_to_csv_row(reports)`
- Require `dnspython>=1.16.0`