Citeproc-py

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- Fix a bug in inline locator markup triggered by
empty term definitions.

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- Use title-short for parallel title match.

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- Fix bugs in awful date parsing code.

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- Recognize a vertical bar ("|") character in a numeric field as
signifying a numeric plural. Useful for multiple descriptive docket
numbers in cites to unpublished cases.

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- Implement cross-cite element trimming and suppression, as
required for parallel citations and subsequent history.

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- Introducing a simplified (and now stable) mechanism for parallel
citation support. Like 2019 revision, assumes cites to be rendered
in parallel share IDs in a seeAlso array attribute. Just three
group attributes perform the magic:
* parallel-first (render in 1st position, then only when one of the
specified variables differs)
* parallel-last (render in last position, and on any change from 1st
in any of the specified variables)
* parallel-delimiter-override: use a special delimiter if collapsed,
or if neither parallel-first nor parallel-last is set on the
group.

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