revise Scorer visitor API
-------------------------
Key: LUCENE-3330
URL: https://issues.apache.org/jira/browse/LUCENE-3330
Project: Lucene - Java
Issue Type: Improvement
Reporter: Robert Muir
Fix For: 4.0
Currently there is an (expert) API in scorer to allow you to take a scorer, and
visit its children etc (e.g. booleanquery).
I think we should improve this, so its general to all queries.
The current issues are:
* the current api is hardcoded for booleanquery's Occurs, but we should support
other types of children (e.g. disjunctionmax)
* it can be difficult to use the API, because of the amount of generics and the
visitor callback API.
* the current API enforces a DFS traversal when you might prefer BFS instead.
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