darcs patch: Fix the version-range parser to allow arbitrary expres...

[Malcolm.Wallace at cs.york.ac.uk]

Thu Sep 10 20:09:12 BST 2009  Malcolm.Wallace at cs.york.ac.uk
  * Fix the version-range parser to allow arbitrary expressions over constraints.
  Previously, only a single conjunction (&&) or disjunction (||) was
  parseable, despite an internal representation that permits arbitrary
  combinations.  Now, any sequence of (&&) and (||) combining forms is
  parsed.  (&&) binds more tightly than (||).
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