LUCENE-5271: A slightly more accurate SloppyMath distance

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1558259 13f79535-47bb-0310-9956-ffa450edef68
LUCENE-5344 Flexible StandardQueryParser behaves differently than ClassicQueryParser

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1558305 13f79535-47bb-0310-9956-ffa450edef68
LUCENE-5375: ToChildBlockJoinQuery works harder to detect mis-use, where the parent query incorrectly returns child docs

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1558334 13f79535-47bb-0310-9956-ffa450edef68
LUCENE-5375: fix javadocs

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1558350 13f79535-47bb-0310-9956-ffa450edef68