Style syntax for related variables#375

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denismaier wants to merge 13 commits intocitation-style-language:v1.1from

denismaier:related-syntax

Commits on Sep 5, 2020

add related attribute
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add related to cs:text with variables
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adds related to cs:date, cs:number, cs:names, cs:group
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simplify pattern
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trangify
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Commits on Sep 7, 2020

add related attribute to tests
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change wording
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change wording in choose
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fix
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refactor relations
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add has-relation test
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related->relation in csl.rnc
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remove non-necessary ? on relation in csl-choose
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