Parsedmarc

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- Fix existing aggregate report error message

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- Fix existing aggregate report query

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New features

- Add option to select the IMAP folder where reports are stored
- Add options to send data to Elasticsearch

Changes

- Use Google's public nameservers (`8.8.8.8` and `4.4.4.4`)
by default
- Detect aggregate report email attachments by file content rather than
file extension
- If an aggregate report's `org_name` is a FQDN, the base is used
- Normalize aggregate report IDs

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- Rename `parsed_dmarc_forensic_reports_to_csv()` to
`parsed_forensic_reports_to_csv()` to match other functions
- Rename `parsed_aggregate_report_to_csv()` to
`parsed_aggregate_reports_to_csv()` to match other functions
- Use local time when generating the default email subject

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- Documentation fixes

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- Add `get_report_zip()` and `email_results()`
- Add support for sending report emails via the command line