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Python parse tree definitions.

This is a very concrete parse tree; we need to keep every token and
even the comments and whitespace between tokens.

There's also a pattern matching implementation here.
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    Abstract base class for Node and Leaf.

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        The whitespace and comments preceding this token in the input.
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    A pattern is a tree matching pattern.

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    A wildcard pattern can match zero or more nodes.

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                min=1, max=maxint: .+
                min=0, max=1: .?
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        Initializer.

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    Generator yielding matches for a sequence of patterns and nodes.

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