LUCENE-834: Added in payloads search package, with one Query implementation: BoostingTermQuery. Added isPayloadAvailable() method to TermPositions and implementations. Modified access rights to some of the spans classes so that they could be accessed from the payloads package. All tests pass.
lucene/java/trunk/CHANGES.txt
lucene/java/trunk/src/java/org/apache/lucene/search/payloads/