Citeproc-py

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- Fix in-text backref behavior (previously completely non-functional).

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- Fix disambig with demote-non-dropping-particle=never

https://github.com/Juris-M/citeproc-js/issues/171

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- Changes to institution name attributes
- Apply use-first and use-last to elements as entered, not as reversed
- Add stop-first to mirror stop-last
- Render as entered by default, require explicit reverse-order to reverse
- Make code less unreadable

- Remove implicit institution name truncation

- Recognize strings and terms in cs:substitute

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- Enable trailing-punctuation suppression in in-text styles.

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- Fix bug in parallel-referencing code.

- Update schema (fix missing or misplaced attributes and elements),
fix syntax issues in style modules, update style tests.

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- Fix a bug in fallback from institution-entire to institution-part

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