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travis-ci

Teach parser generator how to handle simple alternations

A symbol can now be replaced with a tuple of symbols on the right-hand
side of a rule, indicating that either is acceptable in that position.
This has two effects:

 - makes the grammar less repetitive, especially for operators.

 - makes the generated parser slightly more efficient, as some states
   can now be merged.

This has been used to simplify the main grammar. Also, BITNOT should
have been unary; this has been corrected.

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