LUCENE-3892: make branch

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/pforcodec_3892@1352188 13f79535-47bb-0310-9956-ffa450edef68
LUCENE-3892: initial For patch

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/pforcodec_3892@1352200 13f79535-47bb-0310-9956-ffa450edef68
add executable bit

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LUCENE-3892: add PForPostingsFormat

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/pforcodec_3892@1356531 13f79535-47bb-0310-9956-ffa450edef68
remove dead code

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make some fields private/final; add whitespace

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tighten up FixedIntBlockIndexInput

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rename set -> copyFrom in IntIndexInput.Index

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dead code

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LUCENE-3892: revive BulkVInt postings format (from old bulk branch)

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LUCENE-3892: small cleanups to For/PFor postings formats

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LUCENE-3892: fix compilation error

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LUCENE-3892: close IndexOutput on exception

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LUCENE-3892: docs/cleanup

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LUCENE-3892: suppress exceptions from close() while we are already handling an exception

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LUCENE-3892: fix maxChain bug; support numBits=0 (all ints == 0)

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LUCENE-3892: get numBytes & bit width into single int header

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LUCENE-3892: add nocommits

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LUCENE-3892: merge in trunk changes

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LUCENE-4225: BlockPostingsFormat

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