LUCENE-4819: move Sorted[Set]DocValuesTermsEnum to codec

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/lucene_solr_4_2@1457848 13f79535-47bb-0310-9956-ffa450edef68
LUCENE-4826: fix PostingsHighlighter PassageQueue comparator so we keep the best 2 passages

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/lucene_solr_4_2@1457850 13f79535-47bb-0310-9956-ffa450edef68
LUCENE-4826: move to correct section

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/lucene_solr_4_2@1457853 13f79535-47bb-0310-9956-ffa450edef68