Parsedmarc

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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`

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- Move mail processing functions to the
[`mailsuite`](https://seanthegeek.github.io/mailsuite/) package
- Add offline option (closes issue 90)
- Use UDP instead of TCP, and properly set the timeout when querying DNS
(closes issue 79 and 92)
- Log the current file path being processed when `--debug` is used
(closes issue 95)

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- Do not attempt to convert `org_name` to a base domain if `org_name` contains
a space (closes issue 94)
- Always lowercase the `header_from`
- Provide a more helpful warning message when `GeoLite2-Country.mmdb` is
missing

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- Raise `utils.DownloadError` exception when a GeoIP database or Public
Suffix List (PSL) download fails (closes issue 73)

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- Add ``number_of_shards`` and ``number_of_replicas`` as possible options
in the ``elasticsearch`` configuration file section (closes issue 78)