Revision 1373337

LUCENE-3312: Merged revision(s) 1372429-1373335 from lucene/dev/trunk:
move class to o.a.l.index and make pkg-private, silence java7 warnings
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SOLR-3727: improve solrcloud close/shutdown
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LUCENE-4303 Use ResourceLoader not Class.forName
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LUCENE-4302: Fix facet userguide to have HTML loose doctype like all other javadocs
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LUCENE-4152: add one syllable method to enumerate subreaders
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LUCENE-4152: use simpler sugar
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SOLR-3670: New CountFieldValuesUpdateProcessorFactory
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SOLR-3727: improve solrcloud close/shutdown
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Ignore process reaper (forked subprocess on unixish systems).
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document what IW.close is doing and how to 'actually close' if you want that
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LUCENE-4304: remove PayloadProcessorProvider, map facet ords using a FilterAtomicReader
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LUCENE-4304: Make CompositeReader.getSequentialSubReaders() protected
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solrcloud: improve some logging, improve some testing, other minor tweaks
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LUCENE-4307: rename IR.getTopReaderContext to IR.getContext
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SOLR-3572: Make schema-browser show custom similarities
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better failures from MDW if you have unclosed indexwriter, even if you setLockFactory
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Improve Javadocs, fix wrong getContext() javadocs (contained outdated info, leaves() throws UOE if not top-level), remove lucene.experimental from contexts, as this is now the official API to walk reader tree.
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