LUCENE-5399: make branch

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/lucene539399@1558450 13f79535-47bb-0310-9956-ffa450edef68
LUCENE-5399: current state

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/lucene539399@1558451 13f79535-47bb-0310-9956-ffa450edef68
LUCENE-5399: add fangs, fix 2 bugs

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/lucene539399@1558516 13f79535-47bb-0310-9956-ffa450edef68
LUCENE-5399: remove code duplication

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/lucene539399@1558552 13f79535-47bb-0310-9956-ffa450edef68
LUCENE-5399: add fangs, but no new bugs found...

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/lucene539399@1558565 13f79535-47bb-0310-9956-ffa450edef68
LUCENE-5399, SOLR-5354: fix distributed grouping to marshal/unmarshal sort values properly

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/lucene539399@1558618 13f79535-47bb-0310-9956-ffa450edef68
LUCENE-5399: remove nocommit

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/lucene539399@1558621 13f79535-47bb-0310-9956-ffa450edef68
LUCENE-5399: add missingFirst/last support when sorting by Type.STRING; speed up deep paging; fix solr's distributed group sort for certain field types

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1558865 13f79535-47bb-0310-9956-ffa450edef68