Added the nested, updating, and chained subqueries CIP#100

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petraselmer wants to merge 27 commits intoopencypher:masterfrom

petraselmer:CIP-nested-subqueries

Commits on Oct 16, 2017

Added the nested subqueries CIP

Petra Selmer
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Sundry content edits to the subquery CIP

Petra Selmer
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Clarified the syntax wrt `OPTIONAL`

Petra Selmer
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Added the notion of write subqueries, with `UNWIND` + `DO {...}` replacing `FOREACH`

Petra Selmer
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Clarified the way in which variable bindings work (based on comments received)

Petra Selmer
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Addressed some feedback
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Addressing comments; making clarifications

Petra Selmer
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Sketched out additional forms of nested subqueries.
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Homogeneous syntax for OPTIONAL, MANDATORY, MATCH, DO WHEN
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Address feedback and introduce new syntactic short forms
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Add chained subqueries with `THEN` and overhaul document
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Reflect discussion; add new conditional form of DO and WHERE shorthand
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Textual improvements

Petra Selmer
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Refer to Query Combinator CIP

Petra Selmer
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Wording
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Rework CIP
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Clarify precedence rules
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Add ammending nested subqueries and fix query combinator precedence
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Fix definition of chained queries and move to right directory
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Commits on Oct 17, 2017

Textual edits
Petra Selmer
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Clarified query combinator semantics
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Commits on Oct 19, 2017

Fixed erroneous queries
Petra Selmer
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Commits on Jan 17, 2018

Reformatted title
Petra Selmer
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Commits on May 6, 2018

Commits on May 7, 2018