LUCENE-5150: Better compression of dense sets with WAH8DocIdSet.


git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1512422 13f79535-47bb-0310-9956-ffa450edef68
SOLR-5121: zkcli usage help for makepath doesn't match actual command.

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1512435 13f79535-47bb-0310-9956-ffa450edef68
LUCENE-5159: prefix-code the sorted/sortedset value dictionaries in DiskDV

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1512543 13f79535-47bb-0310-9956-ffa450edef68