create branch

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LUCENE-5666: current state to branch

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LUCENE-5666: fix testBasic to use dv always

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progress on testrandom... i think

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LUCENE-5666: fix test bug

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LUCENE-5666: fix testBasic

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LUCENE-5666: add docvalues for JDK collator, too

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LUCENE-5666: fix facet example

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LUCENE-5666: fix AllGroupHeadsCollectorTest

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LUCENE-5666: fix grouping tests

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LUCENE-5666: clean up test and fix testSimple

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LUCENE-5666: more grouping tests

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LUCENE-5666: fix testRandom

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LUCENE-5666: move out more uninverting

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LUCENE-5666: get solr compiling

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LUCENE-5666: javadocs, support SORTED_SET for multi-valued numerics

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LUCENE-5666: actually make a single-valued fc if the field is not multi-valued

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LUCENE-5666: move sortedset sortfield out of sandbox

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LUCENE-5666: add SortedSetFieldSource

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LUCENE-5666: get solr started

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