merge in 4.8.1 CHANGES.txt

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_4x@1595870 13f79535-47bb-0310-9956-ffa450edef68
merge in 4.8.1 CHANGES.txt

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_4x@1595873 13f79535-47bb-0310-9956-ffa450edef68
LUCENE-5682: NPE in QueryRescorer when Scorer is null

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LUCENE-5686: fail if LUCENE/SOLR_NNNN (_ instead of -) appears in changes

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SOLR-5495: Port over from trunk.

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LUCENE-5679: remove the single-parameter deleteDocuments() versions, in favor of the vararg ones

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LUCENE-5679: leftover jdoc fix

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LUCENE-5670: add skip/FinalOutput to FST Outputs

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LUCENE-5691: DocTermOrds lookupTerm is wrong in some cases

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SOLR-5681: Make the OverseerCollectionProcessor multi-threaded, merge from trunk (r1596089)

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Merged revision(s) 1596425 from lucene/dev/trunk:
Update some build tools

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fix wrong deleted docs count in IW's infoStream

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LUCENE-5689: FieldInfo.setDocValuesGen should not be public

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LUCENE-5618, LUCENE-5636: write each DocValues update in a separate file; stop referencing old fieldInfos files

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LUCENE-4236: add a new test for crazy corner cases of coord() handling

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SOLR-5495: Print cluster state in assertion failure messages if a leader cannot be found to determine root cause of HttpPartitionTest failures in Jenkins

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LUCENE-4236: cleanup/optimize BooleanScorer in-order creation

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SOLR-5309: Fix DUP.processDelete to route delete-by-id to one sub-shard only. Enable ShardSplitTest again.

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SOLR-5468: report replication factor that was achieved for an update request if requested by the client application; port from trunk

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SOLR-6108: Add support for 'addreplica' Collection API in SolrJ

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