Move to Lucene 4.9 on stable branch

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1586576 13f79535-47bb-0310-9956-ffa450edef68
LUCENE-5573: Move docvalues constants and helper methods to o.a.l.index.DocValues

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1586600 13f79535-47bb-0310-9956-ffa450edef68
LUCENE-5601: ThaiTokenizer ignores sentenceStart

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1586614 13f79535-47bb-0310-9956-ffa450edef68
Extract the zig-zag encoding/decoding routines we have to utility methods.


git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1586669 13f79535-47bb-0310-9956-ffa450edef68
LUCENE-5602: always verify term vectors on bulk merge

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1586710 13f79535-47bb-0310-9956-ffa450edef68
tone down TestRandomChains to avoid ngram+shingle bombs etc

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1586724 13f79535-47bb-0310-9956-ffa450edef68
extract another zigzag encode/decode

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1586728 13f79535-47bb-0310-9956-ffa450edef68
LUCENE-5582: remove IndexOutput.length/setLength

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1586743 13f79535-47bb-0310-9956-ffa450edef68
LUCENE-5582: add changes entry

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1586748 13f79535-47bb-0310-9956-ffa450edef68
SOLR-5980: AbstractFullDistribZkTestBase#compareResults always returns false for shouldFail.

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1586781 13f79535-47bb-0310-9956-ffa450edef68