Checkdmarc

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- Fix `--timeout/-t` option
- Add `--wait/-w` option

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- Make SPF loops errors instead of warnings
- Check SPF records for `redirect` loops

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- Ignore blank lines/domains in input

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- Include the DMARC organizational domain in JSON and CSV output
- Change CSV field order for readability
- Make JSON output order consistent
- Resolve SPF `redirect`
- Put include results in a JSON list
- Count `exists` SPF mechanisms in the overall SPF query limit
- Make `a` SPF mechanisms count as one lookup instead of two
- `checkdmarc` actually makes two queries per `a` mechanism, one for `A` records, and one for `AAAA` records.
However, [RFC 7208, Section 1.6.4][1] only mentions counting the mechanisms that use lookups
(i.e. `mx`, `a`, `exists`, `include`, and `redirect`), and including each `MX` record returned in the overall count,
(since those in turn will need to be resolved). This aligns `checkdmarc` with 3rd party SPF validators at
[MxToolbox][2] and [DMARC Analyzer][3]

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- Removed from PyPI due to bugs
- Subdomains inherit the DMARC record of the organizational domain

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- Removed from PyPI due to bugs
- Validate existence of MX amd A/AAAA records
- Add a `--timeout/-t` option
- Improve DMARC record syntax validation
- Check for SPF include loops
- Validate `rua` and `ruf` URIs
- Fail SPF validation if query limit reached [RFC 7208, Section 1.6.4][1]